There was a picture on here that someone took of a pallet from HD marked for a sale the 2nd weekend in April. I asked the clerk at the local HD this past weekend and he confirmed he has a couple pallets marked for a sale in the back.
Either way, the wal-mart sale was pretty good. Works up to be $0.26/lb - the equivalent of $10.58 for the 2x20lbs at HD.