Last I looked Fieldsport, British Sporting Arms Ltd and Ballistic Products had some Gamebore shells. Woodcock Hill has been a source for Kent Non-tox as well as Gamebore shells.
I think I have gotten some of the Polywad shells through Fieldsport in the past but have also ordered straight from Jay. These are good shells.
Eley and ARMUSA are done in the US as far as I can tell. Some shops still have a few shells around.
Many stock the RST shells which have worked fine for me. In fact, they are my favorites for my LC Smith as well as my older hammer guns. I tend to buy these shells in bulk when I can to avoid the shipping costs. For example, Alex had the truck at the UP Classic (Michigan) this past June and will have it at Pintail Point (Maryland) for the Vintagers.
The B&P shells are great but stouter in my opinion--not for me in my older guns.
(Same with the Winchester shells from Australia and these are not 2 1/2 inch.)
I have liked the Westley Richards shells when available. I find them to compare favorably to the Polywad. These may still be made by Lyalvale.
