Walmart offers the Signature Sleep Gold 6" Bonnell Coil Twin Mattress-in-a-Box for $62 with free shipping. That's the lowest price we could find by $11.
Update: The price has increased to $63. Opt for in-store pickup to drop it to $61.60.
Are you throwing away money? Before tossing these items that are considered disposable, consider how to give them new purpose.