Selling 10 month old 12 inch memory foam mattress for 300$

Selling an excellent, great condition, 12-inch, full-size firm mattress for 300$, bought 10 months ago for $449. Fits perfectly in the EV beds and has been great for my back! Only selling because we are moving to a place with a queen size bed.
Original link: https://www.costco.com/p/-/novaform-advanced-back-support-plus-12-responsive-foam-mattress/4000325025?langId=-1