finally got my dslr

[mxracer32]

its not here yet, but got it off ebay, went with the canon 20d. i have been talking with a few guys that shoot at the local mx tracks and i have been advised to get a sigma 24-70 2.8 lense. i only see a few on ebay and want to compare with what they are new. i know what they retail for but was wondering what sites offer good\the best deals on lenses? i purchased just the body only so now its crunch time to find some glass! thanks.