I like this method: aircon company advertises to check everything about your aircon for only USD 20. Usually they find something which needs to be repaired and the customers order it from them, the average order is USD 200.
I am looking for similar methods for getting foot in the door for local small businesses, to help them with their online and offline marketing. I have searched Warrior forum, but found nothing usable.
What are your favourite methods? What do you think is the most simple service, which would take only few minutes and increase their sales or leads immediately, to give it to them for USD 20 or for free, just to get foot in the door?