here op https://smile.amazon.com/LINENSPA-Memory-Innerspring-Hybrid-Mattress/dp/B01IU6RMVA/ref=sr_1_24?crid=1A2N6CYZEVLW&dchild=1&keywords=memory%2Bfoam%2Bmattress&qid=1619406492&sprefix=memory%2Bfoam%2Bmattress%2Caps%2C233&sr=8-24&...
$100 on amazon for a twin xl memory foam mattress. I have one of these and its amazing! I ended up buying this to replace a $500+ mattress that was fucking up my back. No regrets.
The future is now.