I bought some of those off Aliexpress, I wanted a metric shank (18mm) and also bought another set with a 12mm metric shank, but I couldn't find any imperial shank sets on Aliexpress so bought a set of Ebay to get the imperial shank.I bought this set a while back. Not sure if or when it will be available again. However, my guess is like many import tools there are other brands with the identical set.
https://www.amazon.com/dp/B09D3BJR7M
Edit: This set looks active, but larger shank: https://www.amazon.com/iCarbide-Indexable-Boring-Inserts-Included/dp/B09D3688BX/
At first I complained about the carbide inserts being an odd standard. Closer inspection of the inserts (under a microscope) revealed a geometry I was very pleased with. After some digging they appear to be a Japanese standard-ish insert. I found several boxes of each size and basically bough a lifetime supply of them.