The vast majority of memory foam is made in bulk by only a few companies, who sell to all the various mattress makers. So with memory foam mattresses, pillows, etc, it doesn’t really matter which brand you buy; the foam is coming from the same suppliers regardless. And the foam itself is actually dirt cheap. The raw materials for the mattress are only like $50-100 total when they’re bought in bulk.

The only real difference between a $3500 Tempur Pedic and a $300 Amazon Basics mattress is which warehouse it was assembled in and shipped from. And you could buy a brand new $300 mattress every single year, spend less money, and be more comfortable at year 10 than someone on a decade-old Tempur Pedic.