I agree. If OP lives near any roasters they should try there first. Even smaller roasting companies often sell equipment. For any Hario filters most supermarkets are out of the question, in my area it’s mostly flat bottom and Melitta #2/ #4.

I’m in the u.s. unfortunately I have not been able to find them locally.

I’d be willing to bet the local coffee shops that have Hario filters bought them on Amazon themselves and sell them at a slight mark up. So either way you’re going through Amazon.