Well if you want to get your hands dirty and build something RapidLED has a sale on their (older?) Aurora pucks for $65 each. These are basically Ecotech Radion knock off boards, not sure which generation though, but with 4 channels to control you can make something neat. Or if you don't want to think about what parts you need they have a number of kits, you still need to build them but they are all solderless, for less than $300, although the programming aspect typically drives the price up.
If you want off the shelf ready to go, that's a bit harder since even one of the cheaper brand name ones (something like the Razor or Ethereal) still go above that $300 price point. Getting a cheap "black box" setup could work, not sure how much programming you can do with them though. Another option as mentioned is to get a strip LED light "accent lighting" and use that in conjunction with the fluorescent bulbs.