i am currently researching memory foam mattresses.
i asked for a sample(was willing to pay for it) from some internet retailers including but not limited to e-mattress,sleepwarehouse.com,memoryfoamsource.com,selectabed,select foam,usa memory foam etc. i wanted to compare their product to Tempur-Pedic(which of course can be sampled in any major walk-in mattress retailer).
they all refused. even though they all try to say their product is as good as Tempur, don't believe. they are very reluctant to have you compare their product to Tempur. i found out that many online retailers get their memory foam from China which uses different types of fill such as clay in their foam.
they also don't abide by the same standards as the U.S. memory foam makers.
BEWARE! DO NOT BUY A MEMORY FOAM MATTRESS FROM AN ONLINE SITE EVEN THOUGH IT SEEMS LIKE YOU WILL BE SAVING A LOT OF MONEY!