Speaking of Walmart, I looked for laptop batteries on Amazon.com, found the exact same type at Walmart.com for HALF THE PRICE. Free delivery also.
Cheap laptop replacement batteries are made with chinese cells, not premium Samsung 18650’s which are considered the best, and will start crapping out (failure to charge fully etc) long before a high quality replacement will. You will find you get what you pay for.
Just be cautious because the power management software in some laptops is designed to screw with non-label batteries.