printing media: thick silver plastic

Hi,
Not quite sure this is the right place but:
I am looking for printing media, a plastic sheet/film, A4 size as
thick as most business cards and with a mirror/silvery-metallic
finish. A long while ago I bought a pack but that company went out of
business and now I can find the same type of media only much too thin.

Can anyone suggest something?

Regards

D

Dima