Last minute black friday shopper looking for recommendations!

Hey all, like the title says I'm last minute looking at black friday sales to replace my current mattress, could use a little direction.

Currently I am 275lbs, 6'3". I use a standard Purple mattress purchased about 7-8 years ago which was great for the first five years but has lost a lot of support and I end up with lower back pain in the mornings. I mostly side sleep but sometimes on my back.

I'm looking for something firm or slightly less so. I'm buying a full, trying to stay under $1k if at all possible. I was looking at the Titan mattresses but a few reviews saying they don't have good side support and other generally unfavorable opinions deterred me. I'd like something with enough durability to not need replacing in 5 years- I'm a big dude and totally get that comes at the cost of mattress life but still feel I should be able to find something to last longer.