It's this exact one, king size, looks like it's still the same price.

It seems these cheaper memory foam mattresses tend to hold heat a bit more and don't cover the softer end of the spectrum (I think I only found firm ones; not my preference but the support they provide makes for a comfortable sleep) so there are some tradeoffs compared to, say, Casper or Tempurpedic, but the savings are great. I've been sleeping on this mattress all year and it's holding up great~