17-35mm f/2.8 digital camera lens used?

www.keh.com
KEH is a very reputable used and new equipment dealer, located in Atlanta, I believe.
If they say it's in EX+ condition, then you probably can't tell it from a new one. Also they have a very fair return policy.
eBay , of course, just be careful.
Good luck!

Try eBay or Craig's list. I don't have one to sell you.