@Woot, hint, hint. Every one of these ‘clear out Mother Amazon’s trade-ins’ sales you sell out of the 3rd Gen Echos in a few hours to a half day at $30. I’d be buying one at that price if I could.
The “2nd gen” Echo Plus is a 3rd Gen Echo + hub (that probably 80+% of buyers don’t use) and not surprisingly, at your asking price of $55, is a sales turd. Deserves an asking price of perhaps $35, at most since few folks care about the hub function. Then watch them sell out, if still a bit slower than the 3rd gens.