Here's a demo by a band from Los Angeles. These guys released one six song 7inch ep in 1982. Sound quality is very good.
some info here: http://www.discogs.com/Dischords-Dirty-Habits/release/2589207
track list:
01. Carbon Copy
02. I'm A Punk Rocker
03. Adverts
04. Now You'll Pay the Price
05. Police Abuse