Sometimes the only thing you need you need to make a good mattress a great mattress is a topper. These Lucid 3-inch thick mattress toppers are made with memory foam gel and have a stellar 4.3-star rating with 2,500 reviews. The price on the queen size has been cut down by about $25 and the king is down $45. But, these prices will only last until the end of the day, so don’t sleep on it!