Through 1/16 Costco has Tempurpedic Mattresses for sale which only comes about a few times a year. These rarely go on sale at retail stores.
A Cloud Supreme Queen mattress which sells for $2,500 at Tempurpedic.com, Sin-n-Sleep, etc. is only $1,600 at Costco. This is still a lot of money but your back will appreciate it! You may even get a raise for being more alert at work which would make this a break-even deal!
The deal comes out to $1,727 after tax in CA. Delivery is free.