Walmart offers the Slumber 1 8" Mattress-In-a-Box, with prices starting at $109, as listed below. Plus, all sizes receive free shipping. That's a savings of at least $21 for each size. This Innerspring mattress features individual spring coils and a 10-year limited warranty. The sizes:
  • Twin for $109 (low by $28)
  • Full for $139 (pictured, $21 off)
  • Queen for $159 (low by $32)
  • King for $199 (low by $51)