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It seems like Amazon sells everything — and that includes cheap mattresses ... bring you the best Amazon mattresses under $400 for a queen, the most popular bed size in the US.

Lindsay Boyers is a certified nutritionist and published book author who writes articles and product reviews for CNET's health and wellness section. Her work also appears on mindbodygreen ...

Amazon is living up to its reputation as being the land of cheap and cheerful ... Element is a medium-firm mattress made with breathable flex foam layer for full body comfort, all topped off ...