They use to. I would call first but big lots would be a better price
They can definitely get you a twin mattress
They do sell mattresses! I don't know if they stock many though, i would call the store for current availability. We have purchased a twin memory foam mattress from them in the past and they have other types of mattresses on display.
No
Don't know that they sell mattresses at all, maybe Big Lots, Mattress World
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