Everyone still refers to it as irving plaza, located at irving place. ive heard no one ever call it the fillmore.
and yes - ticket prices at irving plaza in general arent so cheap. but considering that bowery has switched over to ticketmaster too, those shows arent cheap either. and to make matters worse - you can only buy bowery tix at mercury lounge, during set hours (cash only).
irving plaza is the one place in general i avoid. just never was a big fan of it.