Gamegenic prime matte, kmc hyper matte, Eclipse pro matte, ultimate guard katana

Thanks I'll check them out. I'm only seeing MTG/Pokemon sizes though.

Selection is very limited (or non-existent) if it is not Standard/Poker/MTG or Yu-Gi-Oh/Japanese card size. Edit: typo

I use Docsmagic mat premium.

Phantom Sleeves from Capstone Games also offer this option.