Walmart offers the Slumber 1 8" Comfort Spring Mattress, with prices starting at $69.99, as listed below. Plus, all sizes receive free shipping. That's a savings of at least $35 on each size. It features 7.5" iCoils and the foam is CertiPUR-US certified. The sizes:
  • Twin for $69.99 (pictured, low by $41)
  • Full for $94 ($35 off)
  • Queen for $105 (low by $38)
  • King for $129.99 ($59 off)