> 1,000 pellets for air guns
Airgun pellets are not BBs. BBs are small lightweight plastic spheres. Airgun pellets are ammunition for airguns, they are usually moulded lead or a lead free alloy. Some pellets may be metal ball bearings, but usually that are shaped with a round or bullet like head and a flange at the back.
Search AliExpress.com. There are loads of sellers of plastic BBs. I doubt they are licensed. But there is notably no airgun pellets for sale!