your better off getting a local company to deliver them solus, might cost more, but you WILL get a better return, wouldnt bother with the post office, or newspapers as the all get shoved inside something else (i once had mine put inside a co-op panthlet, trouble was, there wasnt a co-op in my town, so complete waste of money, if people dont use co-op, they dont see my flyer) i had 50,000 go that route, got 6 calls!!!
i try to deliver them myself now, hour each day, or get people i know to help, can never really trust anyone else 100%!!