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