Is it for tables, or hanging from canopy frame?
I’ve tried lots of things, making myself, and focus is easy to transport & set up, too. But what you use will also depend on the product!
For some items I have a couple wood frames that are hinged together, and clamp/screw to the table, and provides some vertical dispaly for wrist bands–but it needs replacing, and experimenting with slatted wood shelving I have left over from a closet project.
For a while I tried using PVC or ABS pipes and screwing to flanges screwed to the table to make a vertical display–wasn’t ideal for my goods, but fairly easy & light weight.
I have also made some frames and stapled plastic “chicken wire” to it (and spray painted it off white to hide the green) and those I hang from my canopy frame to get display walls. It’s pretty light weight. And the first two I have hinged together, so I can close them up and keeps my items hung on it fairly safe, so I don’t have to pack & unpack them from separate totes & set up display again. I use “s” hooks to hook on the display board & then hang my items from.
I’ve also seen another vendor who made large wood frames and had athletic mesh stapled to it for their display/side walls on their booths. You can modify size/hinges to make screens that can fit on the table–but if so, need a good base/way to clamp or screw it to your table.
On some tables, I got nice boxes that I turn over, and sometimes put an old street sign across two of them to create a shelf to get extra height. Sometimes even stacked my storage totes & covered with a nice piece of fabric to add more display area.