Let's start a new thread to collect info on machines and their prices. If we get enough posts, we'll be able to do a quick search on our smart phones while we're at the estate sales and thrift stores. It amazes me how much vintage and collectible machines can vary in price!
So let's post the brand name, model name or number, the city and state you purchased it, the approximate date you purchased it, the general condition of the machine and the price. Also helpful to know any accessories, cases, manuals, table, etc that was included in your purchase Be careful to key in the correct spelling for more accurate searches!
Come on ladies, send in your info! Let's put together a comprehensive sewing machine pricing guide! Feel free to post a photo!

OK, I'll start. I bought a New Home model 6 NLB, owners manual, accessory box with several feet, buttonhole attachment, in a table in good condition. The machine is in perfect, just service, great stitching condition.
$35 in Denver from a craigslist ad in July 2011.

Not sure a comprehensive price guide is possible. Prices vary so much in different parts of the country...what I'm willing to pay (and some of the others as well) will bring down the values...while there are folks that are willing to pay much more. I'll share my info later when I get more time, but for now, that would be my opinion. These machines are only worth what someone is willing to pay for them. :)

I also bought a Singer model 620 Golden Touch from a Denver estate sale. She was in pristine condition with all original accessories in their original boxes, a manual, extra stitch wheels, perfect carrying case, and a circle attachment too! $50. in July 2010.
I sold her on eBay for $150 plus shipping.

Exactlty true. That's why I want to see city, date, condition, type of sale, etc. It's just meant to be a guideline, even blue book values on cars have a swing range!

Singer 301a, 1951, Black, good condition, with bobbin carrier & 1 bobbin, no attachments, no case, no cord or foot controller, eBay auction, January 2011, $65 plus shipping.

Elna Supermatic, good condition, with case & cord, no attachments, no knee control, eBay auction, 2010, $35 + shipping

Western Electric 1917 in bentwood case, with cord (needs rewiring) & foot control, very good condition, with bobbin case & bobbin, eBay auction Feb 2011, $32 + shipping

Singer 99, 1928, in bentwood case, good condition, with cord, with bobbin case & bobbin, no knee bar, no extra attachments, Shopgoodwill.com auction, March 2011, $40 + shipping

Singer 66-1 w/Lotus decals, 1909, very good condition, with modern motor & case, with bobbin case & bobbin, with extra feet/attachments, Shopgoodwill.com auction, June 2011, $101 + shipping.

Singer 221 Featherweight, 1957, good condition, with case, with bobbin case & 4 bobbins, with cord & foot controller in like new condition, no extra attachments, local antique mall, July 2011, $225.

We don't have many good machines here locally, since we are somewhat geographically isolated in central valley of California. So I get most of mine by auctions.

Free #5, July 2011, upper Michigan near Rosscommon for $75, with cabinet, all parts and box of "jewelry'. All it needed was a belt and a good cleaning/oiling. It is a treadle.

Minnesota blackside, today, 8/5/11 in a beautiful cabinet for $10, has bobbin case, bobbin, all that but no extra feet. Oh, it's been electrified.

Minnesota with pretty decals in a very rough cabinet, needs cleaned but all parts are there, including extra feet. $15 near Sandusky, Michigan. June 2011

Singer 201, runs like a dream, in a nice cabinet. My son in law paid $60,000 for it. The house it was sitting in was free! LOL By Marlette Michigan.

White Featherweight, 1936, from Craigs List for $300 in the spring.

Black Featherweight, from Craigs list for $179 earlier in the spring.

Eldridge two spools, haven't picked it up yet, but have been assured it is in great condition. Complete with cabinet, accessories, and the original instruction manual. $100 from Craigs List, up by Traverse City.

I also have an Elna Supermatic, Viking, a 127, a Domestic, 3 White Rotary's, and a 66 Redeye. Most were free or almost free. It is amazing what you get when people find out you collect. This should be fun. Oh, and i have 2 more modern Janomes, a 5000 and a 6030. Plus an older Kenmore that Is loved by all.

It will be interesting to see how much prices vary area to area and from online to estate/thriftstore/garage sales/etc too :D:D:D

Singer 401A in cabinet with all attachements and user manual, bought at an estate auction 2004.

301- 1951-Black shortbed mint exterior condition, tag sale in NY $30 no bobbin case...Needed new cords and foot peddle, bobbin case and oiling/greasing cost at Singer dealer here in NY 218...Well worth it...she runs great. Bought in 2011

301A- 1954-tri color beige/tan shortbed in cabinet with knee control and foot pedal, exterior mint, cabinet mint, came with all the feet including buttonholder and zigzagger found on craigs list in Rhode Island for $120...I oiled and she purrs. Bought in 2011

1919 Singer Redeye 66 in carrying case bought on ebay for 54.00 + 20 shipping. Excellent body no paint loss and working condition I oiled.
Bought in 2011

Elna Grasshopper with case that turned into table, excellent working condition I oiled..Bought on ESTY for 85.00 sold on Ebay for 125.00. Bought and sold in 2011

1909 (? no records) Singer 9W, 4 drawer treadle cabinet, good shape, minimal decal loss on bed: $100 Purchased at antique store 2009

1876-1880 Wheeler & Wilson 8, EXCELLENT condition, 4 drawer coffin top cabinet stamped Wheeler & Wilson, minimal decal loss, $100 Purchased at "Re-du" (high end second hand shop) for $100 in 2010. Was missing the spooler, and only had the presser foot that was on it. Later purchased attachments, (glass presser feet and others in W&W wooden box) and spooler for $85.00.

1951 Centenial Singer 201-2. Excellent condition, in a crappy, low-end pressed wood cabinet, no cord or attachments, foot feed had been replaced. $15 at a thrift store in 2010.

1924 Singer 99 in bentwood case. Needs wire work, in otherwise great shape. Purchased in second hand store for $45 in 2010.

1916 Singer 66-1, had been motorized and placed in a "modern" case. Had all attachments. Took motor off and will place in a treadle cabinet that I already had. Decals are good, but not perfect. paid $15 at an antique store in 2010.

1960 (?) Kenmore. Came in cabinet, with attachments, no cams. Later purchased cams. I paid $15 for the machine. I've removed it from the original cabinet and placed into a nicer desk style cabinet that I paid $20 for at a thrift store.

1978 Kemore. Free, it was my mother's machine.

1980 Huskylock serger, again free, it was my mother's.

1956 Singer Featherweight. William paid $300 for this machine with attachments because it's a 1956 model like me. :) Purchased off of Craig's list.

1934 White Number 8 Vibrating Shuttle. Excellent condition, paid $5.00 at a junk yard.

1946 Singer 15-91, purchased from a customer for $20, in a Queen Anne cabinet with stool. Came with blackside attachments, Excellent condition.

1915 Singer 28K handcrank. Excellent condition, family owned prior to me. Bentwood case in excellent condition as well. Came with original 1915 manual and a few attachments. Paid $25.00 in 2011. Craig's list purchase

1909 (? questionable age, but that's close) AG Mason New Florence. In unique treadle cabinet, with attachments. paid $100 in 2011. Excellent condition. Craig's list purchase.

All machines purchased in Oregon.