Hi David,
I’m trying to help Phoenix out here, so we’ll see if I cover the things he normally does 
If you’ve not already done so, the first place to start is here:
https://forum.mattressunderground.com/t/how-to-look-for-and-find-the-best-mattress-for-you-read-first
It discusses how to evaluate and select a mattress that’s best for you, including materials, quality, durability, PPP (posture, pressure relief, and preferences), as well as how to identify higher quality beds.
I’d also note that if your budget is $87 for a bed, there’s precious little that this forum will be able to help you with.