If something goes on sale past the official price adjustment time, I will just re-buy the item at the sale price, and return it with the first, full-price receipt, so long as it is within their return policy timeframe. I figure that if I buy something and can return it within 90 days (most common return policy I see), then why should it matter to them that it is the IDENTICAL ITEM that I just happened to purchase twice? It is still in brand new, tagged condition ready to go right back on the shelf.
I am very honest, and don't want to do anything underhanded, so please share if you don't think this is legit. And these are only big, national stores like Walmart or Target, not boutiques or small mom and pop stores.