surely the one in the showroom should be the same one you receive? they can't put an expensive mattress there and then sell a cheap bargain basement version. that would be illegal.
the only thing i can think of is that one brand and type of mattress does often come in a couple of categories of hardness. was the hardness specified when you ordered yours?
in that scenario, i guess you got the hardest one, and the matress in the showroom may have been medium or soft.
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