Do you have to trade in ahead of purchase? I would be more interested in trading in at a store (just to save shipping effort/time, store is close by) after purchase. Usually I’d buy a new Mac and only once I decide to keep it (14 day window) try to sell off the old Mac (if at all). And of course if I could sell them the old Mac after purchase of the new, I’d probably also prefer cash to store credit. Oh well. Doesn’t sound like this is for me. There’s still Sell Your Mac I can check out.