Best way to obtain quality scripts for independent (Score 1)

We are starting a small production company in Las Vegas, and need a supply of quality low budget unproduced screenplays to read. What is the most efficient way to solicit for submissions without attracting an ocean of really bad stuff? (there are only three of us, and only two who can evaluate scripts.) We can't afford to pay up front - so it'd have to be writers without representation. Contact film schools? College writing departments? Please help. Thanks.