your best bet might be on Ebay then the sellers of wet tumblers .. from my brief knowledge of wet tumbling they all use SS pins .. that can get stuck into the primer hole .. i would think small SS balls like bb cal .177 would work a lot better ... they would just roll across the reloading room farther if spilled lol ..
They make pins that are large enough not to get stuck in the flash hole. I have heard of people using chips so they don't get stuck in the flash hole or the case neck. Sorry IDK a good source. When I move from ultrasonic to wet tumbling I'm going to try it without media and just use the brass juice so I don;t have to be worried about separating the media.