Soem time back I wanted to make some (to get them printed, I loathe homemade cards, they look bloody awful!), so I got onto PSIA to scrounge a bromide of the logo off them. They wouldn't give me one, but said they make cards.
I really think they should advertise it better, it's done by the educational people, they get you to do a form, then send you a proof you can fiddle with.
It has the logo, and "PSIA Educational divison" on it, and any words you want. They are professionally done, and I haven't lost any to wetness yet. Can't remember how much they cost, it wasn't bad though. And a boxful lasts for ages.