Like all Select Plus members, I receive at least 4 one-class upgrade coupons and 2 companion coupons per year. Frankly, I often don't make much use of them, since I don't live in the Northeast. The coupons are transferable, but aren't supposed to be sold. Accordingly, I'm looking for a reasonably active marketplace to trade them. There's only slight demand for Amtrak instruments at flyertalk.com's Coupon Connection, where people commonly trade airline and hotel certificates and points. Any ideas for a more active marketplace? I'm not looking to give these certificates away, but rather to trade for air, hotel, rental car instruments that I would make greater use of.