Hi Cassie,
As you can see in post #2 here and the other posts it links to … this is a fairly “standard” suggestion. If the store you purchased from has any good quality/value mattresses and discloses the information about what is in them, then it may be possible to exchange for a mattress using the same criteria as I suggest if you were buying a new one in the first place … but in many cases chain stores don’t carry any good quality/value mattresses or don’t disclose any meaningful information about their mattresses and in these cases then the most effective approach is to minimize the use of “unknown” foam in the comfort layers and choose a very firm mattress and add your own comfort layer in the form of a topper.
It all depends on what they have available and on your ability to find out any meaningful information about their mattresses. They at least do carry one manufacturer which may have some better quality/value available (Sherwood) but I certainly wouldn’t pay more for any mattress unless you know the quality details of all the layers that are in it… If you are in doubt you can look at the law tag which includes a listing of the types of materials in the mattress listed by weight. It doesn’t have any information about the quality or layering of these materials though (every material has lower and higher quality) so if it contains polyfoam or memory foam especially then it’s important to make sure you know the all layer details by thickness and in order and the density of all the polyfoam or memory foam layers.
Phoenix