Thumb Score: +1

Amazon has the Brentwood Home 9-Inch Cypress mattresses at best price (camelcamelcamel) for a number of sizes (263 for full size, 182 for twin, 180 for twin XL, 300 for queen 390 for king). This brand prides itself on non-toxic and natural and has Greenguard gold and CertiPUR certifications and a 25 year warranty. Beware though that 9 Inch, I’m guessing, is probably best for lighter people and children.

https://www.amazon.com/Brentwood-…-inch+full