Hi and welcome to the forum, drralbert :)
Here are the suppliers I found that carried hockey pucks and offered dropshipping -
This supplier is located in Canada but doesn't ship internationally, unfortunately. Although I would suggest contacting them directly, many suppliers are willing to accommodate special requests - Link hidden: Login to view
This supplier is a US based wholesale/dropshipper - Link hidden: Login to view
Hope this helps, please let us know how you get on.