I drop 20,000 leaflets twice a year, i used to get a lot of work this way years ago but over the last few years it slowed dramatically, i still do it though just to keep my name in the old terraced streets ive always delivered to,as something might come up. 20,000 colour leaflets cost around £250 if i remeber right.
best to use colour well designed else theyll get binned straight away as people will think ur a pikie !!!