Buy Cheap Box Spring May 2026

If your slats are more than 4 inches apart, your mattress may sag into the gaps. Look for "mattress foundations" with more slats if you have a heavy foam bed.

Zinus WonderBox / Smart Box Spring (~$70–$110). It features a steel frame that snaps together without tools. Reviewers praise its silence and durability, though some note it can run slightly narrow for certain mattresses. buy cheap box spring

Many modern bed frames (platform beds) do not require a box spring at all, which could save you more money in the long run. If your slats are more than 4 inches

Amazon Basics Smart Box Spring (~$80–$100). This all-steel foundation is highly rated for ease of assembly. Note that it has a weight limit of 350 lbs, making it better for solo sleepers or children rather than heavy couples. It features a steel frame that snaps together without tools

Based on current expert testing and user feedback, these are the standout low-cost options: