50-Pack Self-Stick 5 in Cardboard Easel Backs, Picture Frame and Art Easel Stand Bulk Pack for Photographs, Artwork, Posters, Signs, and Craft Projects (White) - Walmart.com
No Budget Table Top Easel : 5 Steps - Instructables
DIY Cardboard Easel - ARTBAR
Cardboard Easel for Painting, Cardboard Stand - Etsy
DIY Cardboard Easel (A helpful guide with photos) - Art Play Heart