I have a Canon XTI that I just bought from a photographer and I bought it with two lenses, they're both the 18-55mm but one has IS.. he told me he bought it separately after. So, I have the one that came with the camera, that I only used one time. It's clean, and scratch free.
I'm looking to get a 50 prime.. and would be interested in parting with this one... honestly, I'm not sure of what it's worth. Feel free to PM me about it if it's the one your looking to replace.. it's a 18-55mm f/3.5-5.6.
Thanks!