I'm curious about if anyone knows of any good places to create high quality post cards. 

Ultimately I'm looking to create approx 500 glossy post cards with 2/3 images on the front and  2/1 images on the back.  Of course at a reasonable price.  Any help would be appreciated.  Thanks.

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Overnight Prints

http://www.overnightprints.com

www.marathonpress.com
A little pricey but awesome quality.

www.vistaprint.com
Less expensive than Marathon, but at 80% of their quality.

Thanks I'll check them out and see if I can get some samples of their products.