Prices for Beautyrest mattresses on its website start around $800 for its budget mattress in the smallest size up to almost $3,500 for a California king in its most luxurious option.

Size options: Twin XL to California King. BUY NOW $2,849.00 – $4,099.00. ... I can say this Beautyrest mattress is comfortable a million times over, but once again, that’s subjective.