In reply to robhorton:
Depends what terms you agreed? Usually if you buy something in the showroom you take it away. Did you agree a 6 week delivery time?
The idea of them replacing it makes me very suspicious. If they needed that model why sell you a used one (presumably at a discount) and then bring in a brand new one to also display and then have to sell at a discount.
Either you've bought a broken bed, or it was a sales gimmick to get you to buy, or they're not making any sense.
I have notice, when looking at sofa that a lot have "Sold" on them. I wonder if it's a furniture store gimmick. Sell the in-store ones for a small discount - that way it makes it look like things are selling well - and then keep replacing them. Perhaps it encourages people to part with their money.
Anyway, get in the store and start haggling on the price or the delivery. If that bed has any additional scratches / damage you might have a problem getting any resolution from them.