If you are at all handy in woodworking you may want to consider building an inexpensive canopy and installing a 2 x 40 watt flourescent fixture. It's not hard to do if you have time to do it and you should be able to come in under $50 if your really frugal. Looking so spend closer to $100 you could get better looking wood and such. Either this way or buying retro kits would both work for what you are trying to do.