I have no idea at the moment how to find the link, but I read an interesting article a while back on mattresses. A guy spent a lot of time researching the industry and its practices and came away with several take aways. 1. Mattress thickness is often irrelevant past a certain point and is more of a marketing gimmick then anything else. People perceive a thicker mattress as being more comfortable, when often the thickness means little to nothing in this regard. Companies will make mattresses thicker for no other reason then to add to the price tag knowing that the consumer will see it and think it is going to be a better and more comfortable sleep. 2. Manufacturers name mattresses differently for different retailers so consumers cannot price shop models. 3. Pillow-tops are pointless to spend a bunch of extra money on. You can just add a pillow-top/mattress pad for a quarter of the price and get the same feeling out of it. 4. The stores themselves are designed to play people. If you walk into a store and are not happy with prices they will often take you to a back room with some undersized, crappy looking, mattresses and tell you that's your only other option. I know this one for a fact, because I had it happen to me, twice, when I was shopping. 5. Mattresses are ALWAYS ON SALE.