Bamboo Expandable Kitchen Cabinet Pull-Out Shelf for $29.99. Select in-store pickup at Walmart to save on shipping. Otherwise, shipping is free on orders over $50. Here is a screenshot for reference. Alternatively, it is available at Amazon for $29.99 with free shipping on orders over $49. The shelf on wheels is made of lacquered hardwood, expandable from 11.5″ to 17″W and can be used in bathrooms, pantries, kitchen cabinets.