A local apartment building put the word out "free landscape rock please come and get it". Their insurance is requiring they change from 1" river pebbles to tree bark mulch. Apparently the change will save them $2000 a year on insurance (due to kids throwing rocks and breaking windows).
We've gone twice so far. It was much cleaner than I expected (I imagined a lot of cigarette butts and dog poo and trash). I've had several projects waiting on rock so I'm excited! We've gotten 25 full 5 gallon buckets so far and going for a third run tomorrow.