I was lucky enough to get one for running the demo event and didn't realize how popular they were after wearing it for a few days and everyone asking me how I got it. One person even offered to buy it from me, lol. I'm a pretty big Star Wars fan, so I won't be getting rid of it.
They were only given out at the midnight stores for Force Friday (9-4-15) or for the person running the toy demo event the Saturday before Christmas. Each store only got 3 shirts (one M, L, XL) for the demo event. The Force Friday shirts have #sharetheforce on them, the demo shirts do not.