1/48 Ushi bombs

Anybody have any ideas where I can find a set of these? Only two dealers listed on the makers site and both list them as out of stock. Apparently, the maker does not sell direct. They have an outfit that will buy them for you. BUT they charge the maker’s price + a charge to buy them for you+ shipping charge + a fee for setting up the shipping … Or does anyone have a 250 kg and 500kg that need a forever home?