Walmart offers Premium Smooth Fabric Mattress Protector - 100% Waterproof, Top Protection, Twin/Full/Queen/King for $15.99 (orig. $36.99) with free store pickup.

Product Description:
Why choose our waterproof mattress protector Tastelife mattress protectors are well known for their premium protection against, fluids, urine, perspiration. This has made them especially helpful for those with kids, pets, asthma or incontinence. With just one unprotected fluid accident, a mattress can be left with a permanent stain or odor. Tastelife premium mattress protectors safeguard your mattress against fluids and stains offering peace of mind and a good sleeping environment for you and your family.

• 100% Polyester ,100% Waterproof TPU coated back,Waterproof protection from spills and stains
• Fitted Sheet Style Design - Twin Size Mattress Protector 39" x 75" - Fits up to 14" deep
• Goes on like a fitted sheet and offers comfortable top of mattress protection
• Soft, breathable fabric creates a more comfortable sleep surface, no crinkling sound or plastic feel.
• Machine washable and dried on low heat; easy to follow care instructions help you make this protector last.

Thanks Angie