There are several manufacturers’ sites and of course Overstock.com where you can find a memory foam mattress sale every day of the week. At Overstock they are having a memory foam mattress sale with a variety of mattress toppers available from a one inch model (avoid the item, one inch of memory foam will not help anyone) for $39.99 to a four inch model from Serta with contour pillows for under one hundred fifty dollars ($150). The key to purchasing anything from Overstock in memory foam is the country of origin for the foam itself.
Any foam produced out of the United States is suspect due to a lack of quality control unless it was manufactured in Europe. Tempur-Pedic is a leader in the European market as well as the United States and produces mattresses with strict tolerances and an eye on keeping the environment safe from the manufacturing process. Chinese manufacturers have been in the news over the last few years due to the lack of institutional control at factories and an utter disregard for worker and end consumer safety. There are many harsh chemicals used in the pouring of memory foam mattresses and toppers that can create allergic reactions in workers and consumers alike along with a variety of air born chemicals that unless contained contribute greatly to the greenhouse and global warming effects.
If you want a memory foam mattress sale on a full mattress Overstock offers an eight inch model from Serta that had an original retail price in Serta dealers of over one thousand dollars ($1000) that you can buy today for four hundred twenty nine ($429) dollars in King Size. Do not get sucked in by sale prices at some retailers. Take a look online and you can get great products from Absolute Comfort who is offering free shipping on any order over $195.