Many manufacturers have started producing memory foam mattresses. This caused a memory foam prices come down significantly, and eventually become affordable for all products. Although this also means that the memory foam has been introduced a considerable number of quality, which allows low-quality products, and come.
Memory foam mattress is not a commodity item, but not all are not equal. As a piece of advice, you should avoid mattresses and pillows in the market very cheap version. Their mass density is usually not the highest quality and will never provide the same quality of peer error.
Here are some caution. Memory foam mattress when you are looking for, what type of foam it is prudent. Some manufacturers have found a bubble in between, so that they can fill with more money to poor quality. This also makes this not a true memory foam mattress or mattress. The best bubble, you should buy one for five pounds of memory foam, because it's comfort, it offers to you.