$50.99 Large Mattress Protector - Bed Pee Pad for Kids, Incontinence - White 36x58 - Walmart.com 
Modern Sleep Defend-A-Bed Deluxe Waterproof Mattress Protector, Multiple Sizes - Walmart.com 
Quick Dry Plain Waterproof Bed Protector Sheet (Double Bed) â Orchid â Baby's World
