I know this is resurrecting an old thread, but this thread came up when I googled "side table for Weber charcoal grill." Anyway, I found this on Amazon and ordered it for my son to use with his new-ish grill. It got great reviews. I will let you guys now how he likes it.https://www.amazon.com/BBQ-Dragon-Clip-Charcoal-Grills/dp/B06X9G3V63
You can always make one, like the old school Weber Table. I have looked into it and it would be less than $40.00 to make one with all the materials needed.