I was in much the same predicament as you and I also started on eBay and Amazon. After staring at prices, wavelengths, and LED manufacturers, I can tell you one thing about purchasing LED: You get what you pay for. If I were you, I'd stick with a tried and true light- the Blackstar series (if you aren't willing to have something shipped from China). They are the most affordable LED without sacrificing quality (some would argue).
If anything, get in contact with one of the manufacturers and talk to them directly. In almost every case you can save a few dollars and maybe even tweak it to your liking. What I found most helpful in my search was this forum. Good luck!
Aloha
