https://sites.camel.com/tiap/Camel/Contest -login or register, then click get started under the Taste It All Project. Then select poster press under the activities tab and create your poster.
http://www.classroomvictorygarden.org/classroom-poster.html -school name required
http://www.qart.com/freegift.aspx?items=60 register for a free account to get a free t-shirt or poster. You have to confirm the link in your email once you register.
http://www.poets.org/posterRequest.php -Free posters are available, while supplies last, to teachers, librarians, booksellers, and community organizers to help with their poetry celebrations.
http://nrcspad.sc.egov.usda.gov/DistributionCenter/product.aspx?ProductID=12 -click add to basket and checkout
http://www.heidelbergengineering.com/us/free-posters/ -company name required