Shop the MacyBed by Serta Premium 10" Plush Mattress Collection at Macys.com and enjoy up to 50% off through 8/19! A 10" Plush Mattress in twin, twin XL, full, or queen size drops to $399 from original prices over $700. A king or California king size 10" Serta mattress drops from $1,629 to $799. These are the lowest prices we could find. Foundations, sold separately, are also on sale. Mattress orders of $787 or more get free White Glove Delivery. Mattress orders under $787 have an $85 White Glove Delivery fee. Sales tax is charged in most states.