This one: arrive at Saphan Kwai BTS. Leave direction of Victory. Walk on the opposite site of Big C, about 30 meters. Turn in a little soi. You'll see the theatre at the end of the soi.
Since you (and all the others) say Paholyothin is closed, I take it this is a different theatre. The name is Pahol Theatre.
Yup I got it for very free
!!! And definitely with a lot more passion than Bt 300 would buy. I guess I did someting good, she asked me for my address afterwards, wanted to do it again. But my boyfriend probably would not like that.