If I am riding by myself, I always stop and pick up the change, never have found any dollar bills.. My sister and her DH got me started on doing that when we used to have time to walk once a week. I do see lots of pop/beer cans that could be turned into change. My mom who grew up during the depression picks up any change and you would thought she just won the lottery..and she also will pick up all the above mentioned cans on her walks.