Convention Merchandise: Sunday Sale?
It's a pretty common site. By the time Sunday rolls around, the Sunday sale signs start popping up around the show floor.
On one hand, it's an effective -- and acceptable -- method of reducing your stock before the convention closes. If you have the choice between selling a stack of books at a deep discount and paying to have that stack shipped home, it might even be worth it to take a loss on the deal.
But I can never bring myself to do it.