Offset printers for marketing materials

1-800 Postcards  http://www.1800postcards.com

4by6 http://www.4by6.com

ADG Printing http://www.adgprinting.com

Americans Printer http://www.AmericasPrinter.com

Club Flyers http://www.clubflyers.com Postcards, flyers, and more. Minimum quantity 5000.

Copy Craft  http://www.copycraft.com

Color Q http://www.colorqinc.com Caters only to the fine art market and specializes in four-color offset lithography printing.

Custom Postcards http://www.custompostcards.com

DesignsNPrint http://www.designsnprint.com Minimum quantity 1000

GFX Printing Services http://www.gfxinc.com

Modern Postcard  http://www.modernpostcard.com  1-800-959-8365  

Premium Postcard - United States Postal Service http://www.premiumpostcard.com No minimum quantity. Print one or thousands.

The Print Guide http://www.theprintguide.com links to many companies that print postcards