Avi Buffalo at Bowery Ballroom (03/03/10) Words by Annie Reuter, Photos by Jon Klemm Download: Avi Buffalo – “What’s In It For?” The new record by 18 year-old singer/songwriter Avi Buffalo (aka Avigdor Zahner-Isenberg) doesn’t come out until April 27 on Sub Pop, but right now he and his band are in the midst of…