$16.88 - 55" Inflatable Camping Mattress
https://www.walmart.com/ip/seort/672361638

• Dimensions: 6'6" x 4'6" x 7.1", Flat sleeping surface and velvet touch.
• Can be inflated with a pump in 1 minute, Very fast Seconds valve.
• Deflates instantly by removing the valve.
• Weight: 10.8 lbs, Volume: 12.2 L, 
• Including one Bag to carry the Mattress.

Quá rẻ luôn, nhưng nhiều quá rồi . KKKKK