Sorry for the dull topic!
We are trying to order beds and mattresses to be delivered when we arrive but I am confused by what seems to be on offer. In the U.K. we would just buy a sprung mattress and that would go on the bed slats, job done. When trying to buy in the US all I can see in Target, for example, is a Casper mattress which is very expensive or a foam mattress and both say they need a box spring. What does this mean?