Spa Sensations by Zinus Serenity 8" Memory Foam Mattress On the market for a new mattress? The Spa Sensations by Zinus Serenity 8" Memory Foam Mattress ($248, originally $279) has a durable support from high-density foam base layer for a firm but cushioned feel. The mattress also has green tea and charcoal-infused into the memory foam to help eliminate odours and promotes freshness. It comes in sizes twin to king. Image Source: walmart.com Spa Sensations by Zinus Serenity 8" Memory Foam Mattress $248 from walmart.com $279 $248 Now 11% off from walmart.com Buy Now