The mattress I got from Amazon was the Queen 10 inch Signature Design by Ashley (I’m on mobile so hopefully the link doesn’t mess up):

https://www.amazon.com/dp/B07B9KDM5R?ref=ppx_pop_mob_ap_share

I bought the queen for $255 back in November but it looks like it’s out of stock in the full and the queen 10 in. is currently sold by different sellers at a higher price. So I suppose you could get the 8 inch one? The nice thing about this mattress is that you can pay for it in monthly installments too. It’s definitely a bit firmer than I expected based on the reviews I read—probably like a medium firmness. I definitely recommend it though!