Compact Flourescent Lights. They're the spiral shaped lights. You'll find them about anywhere, no worries. They use less wattage than incadescent lights, so go for the highest wattage you can find (40w is good per light, unless your lamps can support something higher). Generally, the more lumens (amount of visible light) per CFL, the better. Depending on the brands you find, you might see the lumen listing on the package. Forty watts is ~ 2600 lumens, usually.
And keep those lights close to the plants. 2-4 inches if the CFLs are cool. They generally don't penetrate well past six inches.
Oh, and as for the setup, you can use regular lamps; I've found that floor lamps seem to work the best when you unscrew them and hang the shade/reflector. However, using a bathroom light fixture or something is ideal (though a tiny bit more work)- there are plenty of guides on this site for adapting one to a wall plug. If you can, at the very least, see if you can find a "y socket splitter". They look like a "Y", with two light sockets coming off of an end that you screw into the one lamp socket. I'm sure you know what I mean.
~Ethno