vista print now have vinyl banners for indoors or outdoors, great if you are having a booth somewhere. The small one is free right now and the larger ones are reasonable priced. i just ordered mine.
The only problem I saw with the big banner, which is the one you'd need for a booth, is that they're putting hangars on the ends only. Which makes the middle sag. For a big banner you need grommets and the top ends and very so often along the top for those hook things that you use with the typical pipe and drape.
Duct tape. All things are fixable with duct tape!
Can't you even get it in different colors now so you could make it match your banner.
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