This looks SO comfy, perfect for overnight guests. $249 from West Elm.
this would be really nice in the office. can convert into guest room. Full Futon Mattress | west elm
Queen-size 5-inch Futon Mattress
The Japanese Shikifuton mattress makes a cozy, minimalist sanctuary.
This is a website with restored beds for sale, I wish I had known about it a long time ago!
Found it at Wayfair - Phoenix Marmont Storage Drawers Futon and Mattress
Six inches thick, this classic laced full-size cotton-covered futon mattress features comfortable tufting and a soft foam core for restful support. This classic futon mattress is available in several popular colors and fits a standard futon frame.
Better Homes and Gardens Wood Arm Futon with Coil Mattress
Serta Futon Mattress - Full,