The physical tengwar cards came in the anthology boxes. They were a way for Decipher to hand out their best cards, whilst not devaluing the original copies. Mine are not foiled, and I don't know of any that were.
The Tengwars on Gemp are given out as rewards for doing well in leagues (a show of skill, rather than the physical cards that were less valuable than the standard versions). You used to be able to foil them in the merchant, but that capability assists to have been lost.