Hi Paul,
Problem with using delivery companies is they normally deliver several at a time and most householders will pick up the lot and bin them.
I think you're probably better off either delivering them yourself or finding reliable people to do the job, could find them by putting advertising cards in local shops. Even ask people you see delivering leaflets / papers already.
Same as going inside newspapers, reasonable enough price wise but when tucked in with a few others they will end up in the bin as well.
All the best,
Jason.