The American Bell Association is a group of bell collectors and enthusiasts. We do not sell bells and we do not appraise them. If you post a request for where you may find a seller of bells the size and material that you are looking for, I suspect others may post a recommendation of where you might look.
Then, once you have your bell (or even before), we’d be glad to have you as a member of the American Bell Association (visit: https://americanbell.org/join.htm). As you can see, we have quite a few people who either collect or study big bells!