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This 2 inch Twin XL Size Accu-Aire Memory Foam Mattress Topper, listed at $185.99, is $29.99 at Buy.com. Plus, shipping is free. That's the lowest price we found on any 2" Twin XL topper. It is constructed from 100% viscose elastic memory foam, which is hypoallergenic and anti-microbial. There is no sales tax (except KS).