Zinus Metal Twin 7 in. Smart Box Spring HD-ABS-7T - The Home Depot
Zinus Edgar 8 Inch Profile Wood Box Spring/Mattress Foundation, Twin HD-WDBS-8T - The Home Depot
Legacy Twin Size (39"x75"x8") Mattress and Box Spring Set - Fully Assembled, Good for your back, Superior Quality - Long Lasting and 2 Sided - By Dream Solutions USA - Walmart.com
Twin XL - Box Spring - Canadian Liquidation
Twin Box Spring Size Chart | Mattress size chart, Mattress sizes, Standard mattress sizes
Will Twin XL box springs work for a regular king size bed? - Quora