DIY kits for LED's are definitely the cheapest way to go? What's the dims of the your tank? I got my LED strip from drfostersmith.com but I know there's plenty of others out there. I'm an "ebay wh**e" so I got my t5 lighting w/ built in timer from there. You can also find some good led kits on ebay as well, even some LED fixtures for a decent price. Most LFS I've found from personal experience, overcharge for fixtures so if you're ok with waiting a few days for shipping then I would say I've had the best luck with ebay.