I just ordered a set of T1 bars yesterday, so as soon as they arrive I would be willing to sell my OEM bars. The car is a 2004 Z06 with 6000 miles and no horror stories. Just a good, clean set of used bars.
They would be shipping from zip 48165 (SE Michigan), but again I could not send them until my new stuff arrives...so it might be a week or two.
I don't have a price in mind, but you can shop around and see what they are going for. I would probably accept any reasonable offer.