I found one online just today, and I don't know if it has been mentioned before so I thought I'd go ahead and post it here:
www.amusementpark.com has discount tickets (not a huge discount, but a couple bucks is a couple bucks), not only for Cedar Point but for parks all over the country.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/