The parking meter cards that debuted last winter are proving popular with drivers, the Examiner reported today.

The cards can be purchased at several locations throughout the city in values of $20 or $50. main problem with the cards now is that they cannot be refilled and a new one must be purchased when the first card runs out of value. In the future, TransLink will begin accepting the cards, so they’ll be good for fares on Bay Area transit agencies.

Sounds like a great stocking stuffer for your San Francisco friends.