Portable, no-tools-required tabletop display stand - Stu's Portable Display Stands
Collapsible riser portable display stand store by PortableDisplays
Antique / Vintage Book Jewelry Display / Ring storage - Cheap, easy & portable display for craft shows, market display, etc.
I LOVE LOVE LOVE the idea of using vintage suitcases/briefcases/etc to both store and display items at craft shows!
3-Tier Portable Display Riser Shelves / Store Display / by USAVECO
Large Three Apple Crate Shelving Furniture with wheels for easy moving Back Porch
This type of displays could be great, - it folds up and is portable, but needs to be built from light-weight, but sturdy materials.
Portable display stand 3-shelf display craft by artsyjournals