http://www.jameco.com/Jameco/Products/ProdCT/p006.pdf
They just started carrying a bunch of different DC motors, with several 130, 260 and 280 sizes to choose from. Most are priced in the $2.50 range or less. RPMs, torque, current draw, and operating voltage are all listed, too.
No 180 motors, unfortunately, but there's probably something in there that is even better, and for less money.