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I have bought several manuals on ebay....
The 201 manual is extremely easy to find. Singer offer a free download or reprint for $15 (as Miriam said), or there are a million on ebay.
My Singers: Singer 12 MOP (1885), 2xImproved Family (1886, 1888), VS2 Roses and Daisies (1891), 29k58, 66-1 (1914), 96k41 (1949), 201p (1958) 206k11 (1950), 222k (1959), 319K (1960), 320k2(1959), 411g
Others: Bernina Record 530-2 (1958), Bernina 642-1 (1960)
There's almost no reason to ever pay for a PDF manual for the "black" singers. The people selling them, unless they're printing and mailing them to you are a rip off. They're all available on Singer's site, or ISMACS. The originals of course are a different story.
This is assuming Owner's manuals are what you're looking for.
Service manuals are a little harder to find, but the first one I would suggest there would be the WeFixIt Yahoo Group. That's where my 201 and 301 service manuals came from for example. Singer has the 306, 401, etc service manual on their site...
Tammi - I've found that many baby steps tend to get you further than a huge leap in followed by a huge leap out - http://www.archaicarcane.com
Singer 411G, 301A, 2x 221 (featherweight), 222k - the holy grail, 15-90 Centennial, 27, VS2, 28 hc, 128 knee bar, 201-2, 201K HC, 31-15, Pfaff 130-6, Frister and Rossman TS. Non-Vintage - Pfaff 6122, Kenmore (Janome) 385.81595 serger, Kenmore (Janome) 385.81155, 2013 APQS Lucey