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Walmart offers the Spa Sensations by Zinus 4" Memory Foam Mattress Topper, with prices starting from $59.99. With free shipping, that's a savings of up to $20. The sizes: Twin for $59.99 (low by $10) Twin XL for $69.99 (low by $11) Full for $79.99 (low by $13) Queen for $89.99 (low by $15) King for $114.99 (low by $19) California King for $119.99 (low by $20)