Still trying to figure out a mattress

So I have a dilemma I have three herniated discs in my neck and a bad lower back joint due to my car accident. I’ve been sleeping on a cheap $125 Walmart mattress. I want something comfortable that won’t make me broke. I also need it delivered April 15 cause that’s when I’m going to my new apartment.

I wanted a purple mattress but they’re so expensive. And then there’s Casper and dreamcloud and all these that seem more reasonable but people say are bad.. but they’re also more reasonable.. so I’m at a loss here..

I’m 5’2 and 100lbs and my significant other when they visit is around the same side.

I mostly sleep on my stomach but I’m trying to get used to sleeping on my side or back it’s just not as comfy

What do you all recommend?