Nashbar (http://www.nashbar.com/) is clearing out a bunch of Hydrapaks pretty cheap - $19.99. There is also a 10% off code in another thread. I've never tried a hydration pack before but I'm going to try the As Cargo. May be useful this summer when it gets hotter.
Don't know how these compare to camelbaks. Looks like they may be harder to fill but easier to maintain.
Update: Dead deal. They raised the prices.
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Thread: Hydrapaks @ Nashbar