We had purchased our beds from Sears and paid a lot of money for them. When my husband was getting back problems we headed for Sleep World.
We tried out just about every bed they had in the place. We found a King Koil bed with a full 10 year total warranty period. It cost us just $600. For a similar bed at a departmental store we would have paid at least 2 to 3 times this amount.
The guy that runs the place knows his beds too. I highly recommend checking it out before purchasing elsewhere.