Welcome to the Quilting Board!
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: Model 12 (1883), VS2 Painted Red and Cream Roses and Daisies (1891), VS2 Victorian (1891), Model 15 (1917), 27 Tiffany (1900), 66 Lotus (1922), 96k41 (1949), 96k41 (1947), 103k (1950), 201k (1953), 206k11 (1950), 222k (1959), 306k, 319k, 320k2, 401a, 411g
Others: Necchi Supernova Ultra 2, Climax, Empisal (1960s), Bernina Record 530-2, Bernina Record 830, Pfaff 60, Pfaff 260
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 431G, 411G, 503J, 301A, 2x 221 (featherweight), 222k - the holy grail, 99k, 99, 115, 15-90 Centennial, 27, VS2, 28 hc, 128 knee bar, 201-2, Ultralock 14u64a (Serger), Pfaff 130-6, and a Kangaroo coming Nov 2013.