Walmart offers the Ameriwood SystemBuild 54" Wall Cabinet in White for $73.96. Opt for in-store pickup to drop that to $71.22. That's $9 under last week's mention and the lowest price we've seen. (It's the best deal now by $36, outside of the mention below.) It features three adjustable shelves and measures approximately 12" x 54" x 20".

A close price: Amazon has it for $73.96 with free shipping.