Local fabric shop? Most towns have one (thats what I used). If not, ebay.
Should only be a few quid, and will really tidy up your set-up.
I now use the same cloth as an impromptu tablecloth for birthday cakes (if the clients want to use a plain venue table)
When I first started, I made up 2 boards (with frames), covered them in fabric and then hinged them together.
Piccy from 2007;

Feels like ages ago! lol
I covered the rear of the gap with a strip of cloth. It gave me a fairly neat set-up...
That worked fairly well for a while, and I used bugees to secure to my 4' Stand.
Lots of options- and it really depends on your budget and gigs.