Vistaprint offers its Vistaprint Promobox for $5 with free shipping. (Click "Get your introductory offer." to see this deal.) That's tied with our mention from last week, $20 off list, and the lowest price we could find. The promobox is a monthly selection of customized products designed for your business.
Note: You'll be charged $24.99 per month for each subsequent box unless you cancel.