Also, Tuff & Needle is a very popular mail order brand of mattress. I've had this one on my wish list on Amazon for a few months. They've apparently sold a lot of them, there are over 8,000 feedback on this model on Amazon.
https://www.amazon.com/dp/B00QBZ25SS/?tag=cheapaz02-20
TUFT & NEEDLE King Mattress | Bed in a Box | Utilizing Proprietary T&N Adaptive Foam | Sleeps Cooler with More Pressure Relief & Support Than Memory Foam | Non-Toxic Certified | 100-Night Sleep Trial | 10-Year Warranty King $750