The UC Riverside Theatre Dept. has several flats they will give away for free.   There are about 25 theatre style flats,  8 to 16 feet tall and 2 to 3 feet wide available on a first-come basis.  Contact Alan Call if you are interested.

Alan A. Call
Technical Coordinator
Department of Theatre, University of California, Riverside
alan.call@ucr.edu
(951) 827-4644