Whirlpool still seems to have the Whirlpool W4TXNWFW listed for sale, which is available in black, according to the AJ Madison website.

Generally, anything bigger than the "standard" depth cabinet is a custom size. If you are working through a company that carries well known cabinet lines , it will cost a lot to have deeper cabinets made, since they have to be custom made. Most large cabinet manufacturers buy the boxes already made. You can probably do better by finding a local cabinet maker, especially if they make their own boxes. Then you can get them any depth you want.

Bump so it will move down the list

I was intrigued by this as I remodeled and had a medicine cabinet made by the custom shop that did all my cabinets - it is a miniature of the bathroom cabinet doors. I had no idea of what the shelves were made of as I had never focused on them and hadn't specified that detail. They are wood but they are clad in teal formica - I opted for teal blue interiors in all my cabinets and so they are either formica clad for easy clean up - shelves and sink interiors or painted a matching color. The doors are wood and the glass upper cabines match the wood. They aren't particularly thick but they are certainly strong enough to handle the weight of anything that goes in a medicine cabinet - I don't know what other people put in medicine cabinets but mine holds relatively light weight stuff. I have no problem seeing what is on the top shelf as once objects are on clear glass the shelves are obstructed anyway. 🤷🏼‍♀️ I had glass shelves in my pre-remodel medicine cabinet and both seem fully functional. My new shelves and my old shelves are easily wiped down and perhaps it's me but I've never had anything spill in a medicine cabinet - the main thing to clean was dust that would settle in but the interiors are not any kind of space that needs to be cleaned on a regular basis. I guess the interior of my current cabinet is more "elegant" but my old medicine cabinet was a 60 year old standard issue and nothing about either the interior or the exterior was anything other than plain Jane functional. 😂