What stores give away half-dead houseplants instead of trashing them?

My local grocery store will not give me their dying plants because they say they have to send them back to the supplier. But I remember asking stores when I was younger if they'd give me the plants to save rather than junking them in the trash. Are there any large stores (national like Target or WalMart or local, smaller stores) that give the dying plants away? I'm a fairly good gardener and I know I've saved small houseplants in the past. Any ideas?