Hi kardut,
You might want to consider the new Sleep EZ Essentials mattress, which is 3" of soft organic Dunlop over 6" of certi-pur foam, and it’s $299 for a twin! https://sleepez.com/product/essential-latex-mattress/
This is what we call a “loss leader” in marketing terms, which basically means when we sell it we’re losing money, but we price it to be this inexpensive so we can start bringing in new customers and over time those new customers will generate repeat customer orders and referrals orders.
I’m not saying this just to say this, I’ve actually been on this mattress for almost 9 years and it’s the best mattress I’ve ever had, I think it’d be a great choice!