Jinga, that's one of my tricks, too, to leave things I've just purchased on the counter. Usually to be chased out of the store by a clerk.

Dejibo, since you are sensitive to smelly mattresses, similarly to me, I wonder if latex is the right way to go. I am supposed to have a Latex allergy due to Porphyria, but mine is relatively slight compared to some porphs. But I have deliberately not taken a chance with too much latex, and it does have an awful smell. It might be all right if it's wrapped.