Zinus 4 Inch Low Profile Wood Box Spring/ Mattress Foundation, Queen : Amazon.ca: Home
4-Inch Single/Twin Box Spring – Olympicmattress.ca
ZINUS 4 Inch Metal Box Spring White Mattress Foundation / Sturdy Metal Structure / No Assembly Required / Queen, 5 Yr Warranty | Walmart Canada
Spring Solution Spring Solution, 4-Inch Fully Assembled Box Spring/Foundation for Mattress, Sensation Collection, King Size, King Size : Amazon.ca: Home
Box Spring - 4inch Medium Profile Height – Furniture Depot