Did they put it through the books. They may be able to sign it off as damaged goods and pocket the cash hiding the sale from revenue and upstream managers.
First time I bought a mattress I wasn't aware of this. Second time, I got the bedframe, box spring, and mattress protector included, and still managed to knock ~ %20 off the price. I try to negotiate everything now, and have had some measure of success. I will admit that negotiating is mostly, to me, a fun game, rather than a way to save money.