Walmart offers the Slumber 1 8" Mattress-In-a-Box, with prices starting at $94, as listed below. Plus, all sizes receive free shipping. That's a savings of at least $19 for each size. This Innerspring mattress features individual spring coils and a 10-year limited warranty. The sizes:
  • Twin for $94 (low by $19)
  • Full for $129 (pictured, low by $32)
  • Queen for $139 ($51 off)
  • King for $179 (low by $51)