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Can just be a basic white card w/ black text.
Cheapest I've found is copymax w/ 1000 for $12 or so.
I only need about 250-500 or so though, and was wondering if any place had something like this for cheap.
(I saw vistaprint... but that was like $5 shipping for the 'free' 250 cards. That's almost double the cost per card of copymax, plus it's got the crappy ad on it).
Let me know what you've found!