I tried, they are nothing more than a drop shipper.
This was at the height of the COVID madness, I did not receive what I ordered and got a refund without issue. I would have no hesitation trying again now that inventory is more readily available.
Drop shipping by definition is not actually having stock.
If you can’t find something anywhere and BHA supposedly has it, you probably won’t get your order filled and it will be a small PITA. For something easy to find, you will get a good price and probably slow shipping.