Cheap, surplus gearmotors are the way for you to go, but they still might be slightly too fast for what you want. Oooo... you have a lathe?! Scrap wood can make for some nice pulleys. If you ever want to pay to class it up, aluminum can make some really nice pulleys (but expensive!).
Elastic bands (thick, wide ones) make good belts. Larger belts can be made from surgical tubing. Shoelaces and even just good old cord works, too. Whatever you use, you want to make it stretch just a bit to get it over the groove in your pulleys. Make sure it doesn't have to stretch so much that there's undue stress put on the motors' shafts, though (for instance, when using surgical tubing).
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...if you want to run them from a wall outlet, I suggest using a modified computer power supply (easy noob project).