here in cali its not called plasticard.
its made by a company called plastruct.
some hobby stores might have it.
where in california are you anyway?
let me know so i can be a little more helpful.
the ones in SF are called:
ARCH DRAFTING SUPPLY INC.
FRANCISCAN HOBBIES
GRAPHIC BLADE STUDIO
THE LITTLEST MOUSE
PEARL ART & CRAFT
with a phone book it shouldnt be to hard to find them.
A good substitute can be plastic for sale signs that you buy at a hardware store. They are thin, floppy, and white. Same thing (except for the printing on one side), probably cheaper, too.
I live right north of you in Santa Rosa. There is a good hobby store in Petaluma. In the sough bay there is D&J Hobbies and somewhere down there is San Antonio Hobbies. The two south bay ones I believe are huge. I hear one of them isnt too friendly though. Here in Santa Rosa there is the Plastic Surgeon Hobby Shop.