Nothing seems to go for nearly as much on FB classifieds as they do on regular forums or eBay. I've heard of resellers selling Air Jordans for cheaper on there as well. Still well above retail, but significantly cheaper than on eBay or enthusiast forums.

I sold my first set of roof rails for $250 shipped a couple years ago, and last year, I sold a set for $180 cash in person. If you can get a set for $140 or less, you're doing pretty good compared to market value.