Prepac 3 Column Tall Storage Cabinet, Cherry & Black Storage Cabinet with 21 Adjustable Shelves Display DVD Perfect for Living Room, 8.75" D x 56" W x 51" H

Amazon. They used to be called Prepac but might have a different name now. They sell them in all sorts of sizes. I’ve got 3 of the quad width ones and a bunch of the triples and doubles. Here is a link to the triple although it seems like they aren’t selling them in black anymore: https://a.co/d/0263QnEE

Ugh. Amazon says they are not longer available but I bought a set in April, so maybe they still exist elsewhere. I love them. https://a.co/d/039BaZ8K