Mag Source 360 is the complete online resource directory for magazine publishers.Your #1 source for publishing services and professionals Go to Listings Mag Source 360 is the most complete resource directory available for magazine media businesses, with hundreds of listings across more than 30 categories. The directory is a free service—there is no cost to access our listings. Categories include publication printers, fulfillment houses, coop databases, creative resources, paywall vendors, subscription agents, digital magazine platforms, and many more. Let us know if we can make an introduction for you to any of these vendors.