I think the search term will be ball handle switch. I found a decent copy of your original at a very decent price and in Canada too:
https://surplustek.ca/en/toogle-swit...ff-ball-handle
The commercial part number would appear to be 78130TS made by NSI. They can be had from many suppliers (including Walmart) but none of the prices are as cheap as the listing I have given you.