Do you have a limitation to the condition of lens you are looking for? I've got one that is a little beat up and the AF/MF ring doesn't lock, but it still takes good photos. I also have a beat up 70-200 VR I that is beat up but takes good photos and could probably be had for the price of a nice 80-200.
adorama is honestly probably your best bet. Sure, you may get a better price on ebay, but then who do you go to if something goes wrong? I just can't bring myself to shell out a grand to some random person on ebay, whether their rating is good or not. Haha