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$300
Simmons Beautyrest Firm Hybrid Mattress.
I think this is the best mattress I've slept on, and is currently being sold for $1649. It has always had a waterproof and hypoallergenic mattress cover, which I am happy to include.
Adjustable frame included!
https://www.mattressfirm.com/hybrid-12-5-firm-mattress/5637148600.p?variantid=5637159188
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