if you don't want to wire, cfl's may be the way to go
cfl's have their ballast 'built in', cfl has a bulb - then a ballast - then a screw plug
they screw into a regular light socket
lowes, home depot, walmart have cheap fixtures that are suitable for cfl's
you'll need at least 2 bulbs per plant usually, at least for the cheap cfl's, more is usually better