Has anyone seen something like this?

I actually looked for something like this some years ago and couldn't find anything small(narrow) enough. My solution was to buy a vintage corn broom and hang it as a decoration. Looks good and is handy to sweep the porch. Switch it out with a coconut broom occasionally for a little variety.

How small are you looking for??
I bought this for the garage to keep the mops and brooms in.
Elite 16-in W x 65-in H Wood Composite White Freestanding Utility Storage Cabinet https://www.lowes.com/pd/Prepa...e-Cabinet/1000764242

How about something like a freestanding bathroom cabinet?

Internet search for
“Rubbermaid Vertical Plastic Outdoor Storage Shed” perhaps it might work. At least it’s not particle board.