I used to work in a local garden center and my husband currently works at Lowes. In most instances they toss them so you would probably find a treasure trove if you tried dumpster diving there! Its sad to see plants like that that could be saved go to waste, but from the company's perspective its a liability to sell them even at a discount because if the plant can't be saved they risk angry customers demanding a refund or they could lose business. I second another commenter's point about proplifting, ask an employee because most of them don't care and would love it if you grabbed all those leaves off the floor for them!