I went to a small local show in New York this week, and there were some small retractable banner stands we did.
These are nice because they replace what normally would be a foamcore sign with an easel back. These can be put right at the edge of the table, as you see here.
The other big advantage is that they travel better. Foamcore tends to get chewed up with handling, these little banner stands roll back into the cartridge and make it to the next show unscathed.
All in all, these give a very nice presentation when doing a small show, and at a very affordable cost.