One can find typically find project display boards at Staples or OfficeDepot stores as of 2015. One can shop at the store locations or shop online at the store websites. Staples.com and OfficeDepot.com usually sell project display boards in various materials, colors and formats.
At both Staples and OfficeDepot websites, options for presentation boards may include tri-fold and poster boards in foam or corrugated materials. At the main page of OfficeDepot.com, roll over the Office Supplies link at the top menu, and click on the Meetings and Presentations link, then the Project and Display Boards link.
At the main page of Staples.com, click on the Shop by Industry link at the top menu, and click on Education Supplies. Scroll down to click on the Boards and Easels link, and scroll down to click on the Presentation Boards link to find many options.