It came up at the meet this weekend that we maybe need something to catch people's attention to know what the people set up at the table at the meets are about. Yes, we put signs up, but it's easier to have a bigger sign to draw them in from across the way.
A friend of mine makes their own for their tractor implement, but perhaps it's not the only answer. Doing a little bit of searching, there's a couple other designs to consider, the feather/flag banner and a retractable design that looks pretty slick.
Personally if we would go the route for a banner to promote, it might be easiest to mail and transport that retractable style.
Prices I've seen go from $75-200ish for stand and banner.