By performance case - do you mean a case that acts as a stand for your figure? There was a discussion here (I believe) some time back about the one Bill DeMar uses. Not sure who else used that style.
I do not use my cases as a table. I have two different stands I use depending on the situation. One is a custom made P&L base made by Owen Magic, the other is crafted by Al Good. Both pack small and fit into my case, which again, varies by show. A Porter Case when I fly, a Cabbage Case when I am driving to shows.
Al Good's products may be found at:
I highly recommend his work.