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Sears offers the Serta Perfect Sleeper Harlington Plush Eurotop Mattress in King or California King for $779.99. Coupon code "SEARS35OFF300" cuts that to $744.99. With free shipping, that's $1,205 off and the best price we could find.

Note: The coupon also applies to the other sizes, dropping the prices as low as $364.99; the Queen size model costs $434.99 after coupon. Opt for in-store pickup for Queen sizes and below to avoid the $69.99 shipping fee.

Sam's Club offers its members the Serta iComfort Hybrid Applause II Firm Queen Mattress Set for $599 with free white glove delivery. It comes with your choice of a 5-3/4" low-profile or 9" standard split box spring.