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The Primo International UltraBase is a steel mattress foundation for full-size beds, built as a platform base with under-bed storage space. Its all-steel frame is meant to hold a mattress without a box spring and to stay rigid over time. It suits shoppers replacing a box spring or setting up a guest or kids' room on a budget. Against wooden slat foundations it is sturdier and easier to wipe clean, but it offers less give and no adjustability.
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Lowest price we've seen: $136.30 on Nov 9 at Walmart. Tracked across 1 store since Nov 9.
