5 Little Monkeys Sleep System and Zombiebeds are high-quality options offered at middle price. Both utilize same materials and have similar mattress categories. These beds are flippable. These two mattresses can easily fit on adjustable bed bases. US residents can enjoy hassle-free shipping on both beds. You may test out the feel of the mattresses during the at-home trial. You can avail bed-in-a-box facility with both products.