Hi Matt
Bintel sell a range of what they refer to as “JMB Type A Solar” in sizes ranging from ETX-105 through 8” SCTs, 4.5" to 10” Newts and a couple of small one’s for refractors.
My Astro Shop sells what looks like a comprehensive range of Thousand Oaks Type 2 Plus filters.
Being a bit of a sticky beak, didn’t you have a big ‘un for the C9.25?
Cheers
Dennis