EVA Foam Gasket Material

Boy, who knew 'cosplay' was such a large business (search for 'EVA foam')!

I have several cabinets to make with 12" speakers (12.2" outer diameter).
These are FRFR cabinets, speakers are front loaded and I need material to make gaskets out of.

From reading other posts EVA foam seems to be the way to go. I am looking for EVA foam that is soft enough / suitable for gasket material ('cosplay' EVA foam seems to be to 'hard' for this purpose). 'Craft' type sheets seem to only come in 12" x 9" sheets with unspecified hardness.

Anyone know where I can get EVA foam wide / tall enough to cut gaskets from?
My preference:
-- 1/8" thick maximum.
-- 'Rubber Band' softness (Shore A: 20, Shore 00: 20).

Or anyone with other ideas for gasket material (No tape, whether striping, or 'goo' type material. I want to cut the gaskets from sheets) and possible suppliers would also be appreciated.

I am in the U.S.

Thanks.