My whole office is outfitted with furniture in this style from Amazon, specifically this:
https://www.amazon.com/stores/IRONCK/page/7C7224CA-AA7D-42CB-A294-77793F82E2DB?ref_=ast_bln
Closest I could find was this desk that has 2 tiers.
But that top desk part may be too large for your needs. Good luck with your search.