An "official" show that is worth picking up is The Wall Live - "Is There Anybody Out There?". The album sounded better live with some good improvisations during Another Brick p.II, Mother, Young Lust, Comfortably Numb and Run Like Hell. Even though the show itself didn't lend to a very creative atmosphere, I find that live version to be much better than the original release. I only have a few boots and they are pretty old and on vinyl (in storage). Others have remarked about finding shows on the web - I haven't though. Good luck.
Peace.