Need help purchasing used gear

Seems like a pretty decent discount over retail, but not a ton under what seems to be asking price on eBay for the lens. My guess is that he really just wants it sold fast and doesn't want to wait around for the right buyer looking to save $50-$100 on some L glass. Could be that's about how short he is for the 24-70 that he's looking to buy. Since it was the "kit" lens with the 5D Mark II, he essentially got it at a good discount, so he'll probably still make a decent profit on it.

Either way, I think as long as you take your camera and laptop and he lets you play with it for a few minutes to make sure you're happy with it prior to payment, then I wouldn't be too concerned.

And of course all of the usual precautions when dealing with large cash transactions from Craigslist should apply.

I believe that's the average price, slightly undercut to help sell it quickly. The difference between the body only for 5D Mark II and the 24-105 kit is $600, and that's what the seller probably based his prices on.