Memory foam mattresses are not a commodity item, but not all are created equal either. Just as a word of caution, you should avoid the really cheap versions of mattresses and pillows on the market. Their material density is usually not of the highest quality and will never provide you with the same sense of quality as their counterparts.
Some manufacturers have been found putting fillers in between the foam so that they can make more money with lesser quality. This also does not make this mattress a true memory foam mattress either. You can also buy best quality mattress in Australia.
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One last thing to know about memory foam mattresses is how long it will be good for. This is an important consideration, because some memory foams feel great to start, with but will deteriorate as you use them more and more.
Always stick with those products that have been tested and proven reliable when you are buying your memory foam. Just like for example with a car, you will find it greatly to your advantage to go with a product that has a proven history of success in the long run.
Given the above mentioned issues, it is encouraged that you carefully examine the density of the mattress, the source of the foam, and the product as well.
You can always trust the bigger name brands because they have a true stake in staying on top of the market with the highest quality product. As with most things in life, you will always get what you pay for because nothing in this life is free.