Walmart is an infamous major big-box retailer in the United States, Canada, Mexico and a few other countries. For the past few years, many artists have released Walmart-exclusive albums, usually a special edition with exclusive bonus tracks but occasionally the album is a true exclusive, not available elsewhere in North America.
An example of a cleaned-up Walmart URL would be https://www.walmart.com/ip/46186287, which is linked under the "purchase for mail-order" option on https://musicbrainz.org/release/7d7e6665-4980-4c9c-a67d-ce65d500a919.