I've tried quite a few online and local printers for satisfy client request for such things as business cards, and postcards. The local guys are okay but I've found the company Printfirm, PrintFirm, Inc. Full Color Business Cards, Postcards, Flyers Printing to be a high quality printer with below trade prices. Not to say that they have the lowest prices but you can spend many extra hours looking for that.

If you have a lead on a great online printer post it here:
(please we all know about Vistaprint free stuff, so lets omit them.