My wife and I have been sleeping poorly on our old lumpy mattress, and have been keeping an eye out for a good deal on a new mattress. My wife found a queen size Sealy Posturepedic mattress at Costco for only $699 + tax (delivered). A great price, but the mattress is only available in a pillow top version that my wife and I find sleeps too warm.
We visited our local Sleep Train Mattress Center and found the same mattress without the pillow top, but they were asking $1,599 + tax (delivered). While chatting with the salesman, my wife mentioned Costco's great price and the gentleman said they can beat it by 5%.
So, with that one comment, my wife got us the mattress we wanted (non-pillow top Sealy Posturepedic) at a great price $665 + tax (delivered) - a 58% savings. Plus, God willing, we should be able to sell our old mattress for ~$100.