Wayfair Sleep 10" Medium Firm Memory Foam Mattress The Mattress: Wayfair Sleep Memory Foam Mattress ($250, originally $555) Comfort Level: Firm The Thickness: 10 inches Why People Love It: If you're on the market for something that's firm, this memory foam choice is for you. Not only is it top-rated, but it's also afforable. Image Source: wayfair.com Wayfair Sleep Memory Foam Mattress $250 from wayfair.com Buy Now