And here's the first one...
LA City Department of Sanitation offers free compost. You just pick it up yourself. I used to get it in the Valley, but that site's closed now. Right now, the main composting site is in Griffith Park. Their phone number is 323.913.4166. Somebody at the Sanitation Dept told me the Griffith Park compost machine might be broken, so be sure to call before you go to pick some up. But here's their address and a map link showing how to get there:
Griffith Park Composting Facility
5400 Griffith Park Drive
Los Angeles, Ca 90027http://www.lacity.org/san/solid_resources/recycling/composting/griffith_park_facility.htm
Look here for more City Composting services:http://www.lacity.org/san/solid_resources/recycling/composting/