Sweetnight 10 Inch Gel Memory Foam Mattress | $240-$426 | Amazon
Photo: Amazon

If you haven’t replaced your metal spring mattress with a giant block of foam that you bought on the internet, what are you even doing with your life? Amazon’s currently marking Sweetnight 10' gel memory foam mattresses to under $430. Featuring a dual-sided system (one side is a pillow top, the other is firm), a queen will run you just $329 and a king is $411.