Get a small block of foam (the higher the density the better) from an upholstery supply store or an army surplus store; it should be 6" x 6" x 8" or longer. With a sharp knife, make a single straight cut lengthwise through the block. Insert a condom, plastic wrap, or some kind of vinyl/rubber/latex sleeve into the cut, pulling it through from the other side. Lube it up, place it between the mattress and box spring, and enjoy.
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