5" Mainstays Easy Assembly Smart Metal Box Spring Mattress Foundation (Queen) $21.80

Walmart has 5" Mainstays Easy Assembly Smart Metal Box Spring Mattress Foundation (Queen) for $21.80. Shipping is free w/ Walmart+ (free trial available) or on orders $35+. Sets up easily in seconds. An innovative design allows the box spring to easily fold up for storage and transport when not in use. Provides ultra-sturdy support for any innerspring, memory foam, or combination mattress. Mainstays brand. Features a 100% polyester jacquard cover. Constructed with a durable powder coated steel frame for a long life and reliable use. Easy to assemble with no tools required. Available in Twin, Twin XL, Full, Queen, King, and California King sizes.