Walmart.com drops this queen size Spa Sensations 8" Memory Foam Mattress from $239.98 to $189. This mattress responds to the heat and pressure of your body, which creates a comfortable, custom sleep surface. It is also available in twin, which falls from $189.98 to $139, in full, which drops from $219.98 to $169, and in king and California king, both of which fall from $269.98 to $219. It is very highly rated, receiving 4.6 stars out of 5 from over 855 reviewers. Shipping is $24.97 or choose free site to store pickup. Sales tax is charged in most states.