If this site has been mentioned before, I'm sorry and please disregard. But someone I was talking to online recommended this site to me and they have the reptisun 5.0s at a really good price. I didn't look at the rest of the site, maybe they have more good deals on there. I have yet to use the site so I don't know if it's reliable. But it looks like a good deal.
http://www.LLLReptile.com