I posted a response in your other post about a lens that I recommend. It's a little over a $100, but a pretty nice lens.

I'm posting on this thread, since you said that you will probably get it through E-bay. You have to be careful on camera equipment through e-bay. Lot of grey market stuff. But, one place that I can recommend is Flashpoint Cameras. They are an authorized Canon dealer and have very competative prices, plus quick shipping.

I've gotten a Tamron 75-300 lens and 420EX flash from them and was happy both times.