Where to get post cards printed up?

I am going to market my wedding business and would like to print up postcards--- any recommendations on places to print up postcards?
Thanks.

Mpix.com did a pretty good job for me with some Save the Date cards. I would be interested in hearing about other options because with Mpix and postcards you have to use their "card maker" software; you can't directly upload a TIFF. It added a few extra steps of annoyance when they really should let you give them a raw file if you don't want to use the wizard-like software.

There was a border issue on the first batch, they re-printed and sent the second batch out right away... so good customer service but annoying software requirements.

Thanks Hoff......I use Mpix all of the time but for whatever reason was not thinking of them. I have always had good results from them--thanks.

Based on the Flickr cards I've seen, I might try out

http://www.moo.com/pro​ducts/postcards.php