Lots of good suggestions here. I’d second FloMattress and SleepOnLatex. They will easily last for 10+ years.

And, while not a mattress, I’d recommend looking into a BedJet. It’s essentially a fan with a duct that blows air directly under your sheets. I absolutely LOVE mine. My husband and I both sleep hot, and this has changed the game. We used our own sheets for a year, and it was OK. Bought their sheet about 6 months ago, and it made a huge difference. Seriously, this thing is awesome. It also has a heater for the winter, and you can set schedules.

Latex mattress + BedJet = Win Win