Where can I obtain [relatively cheap] holographic paper?

I’m designing tickets for a school show, and I’m concerned about counterfeit tickets (it’s happened in the past at our school). I’m looking to find holographic cardboard (cardboard that has triangles in it, and every other triangle reflects light). Which I could attach to each legitimate ticket that our art class makes. I’m not worried about the holograms containing actual data in them, I’d just want them to shine so that the ticket-takers know what’s legit and any possible forgers would be scared off. I need it to be as cheap as possible (school budget), and available in bulk if possible. Thanks for any information I receive!

(holograms i’m looking for kind of resemble this image:

farm2.static.flickr.com/1240/775287793_eaa32eec0a.jpg?v=0)

holographic data

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