For some reason, you can get almost $3,000 off the Trek Madone 6.9 Pro Red. Usual MSRP for this bike is $9,129. I don’t really know why this is, but this puts the Trek top of the line model in a different light. Second hand, a bike like that would normally fetch around $6,000. This means that the prices will have to come down for used models as well. If I’d have the money, I’d buy a new model right away.
The Madone 6.9 Pro Red is the top of the line model. If you leave out the Red part of the name, you’ll end up with Dura Ace components, which are a bit more expensive than SRAM Red. There are a lot of deals on different Trek bikes if you look through the ad.