Amazon.com: Twin Mattress in a Box, 6 inch Mattresses Made in USA for Kids Bed Single Size Daybed Individual Bunk, Memory Foam Medium Firm : Home & Kitchen
Serta Comfort Air Mattress With Electric Pump - Double High Twin : Target
Serta Sheer Slumber 8-in Twin Memory Foam Mattress in a Box in the Mattresses department at Lowes.com