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 apart, your mattress may sag into the gaps. Look for "mattress foundations" with more slats if you have a heavy foam bed. buy cheap box spring
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. Many modern bed frames (platform beds) do not
Standard box springs are 9 inches, while "low-profile" ones are 5 inches. Measure your current bed height to ensure your mattress doesn't end up too high. Zinus WonderBox / Smart Box Spring (~$70–$110)
Zinus Armita 7-Inch. Highly recommended for those who want a lower bed height without sacrificing the look of a traditional box spring. The Trade-Offs: What You Sacrifice Cheap Box Springs Premium Foundations Slat Spacing Often 6+ inches apart; less support. Typically 2–3 inches apart; best for foam. Materials Thin steel or lightweight pine. Solid spruce, heavy-duty steel, or hardwood. Longevity May start to squeak or sag after 1–2 years. Often lasts 10+ years. Assembly Often required (DIY setup). Usually arrives fully assembled. Buying Advice
Buying a "cheap" box spring today often means choosing between a traditional coil foundation and a modern "smart" metal base. While you can find options for under $100, the "review" of this category is a mix of high value for some and long-term frustration for others.
Based on current expert testing and user feedback, these are the standout low-cost options: