Better to get a data mailing list of the profile of the sort of customers you want to attract in given post codes for example 23-55 year old ABC etc, always have an MPS/Mortascreen check at point of supply.
We would then mail out post cards in batches over a given period say 1-2 months with a code on them and monitor the response from each post code.Depending on the size of the data you have requested you can spend a good few hundred on postage as well but this is far more reliable and you know its getting there.
Costs a few hundred to get the data at first but you can use time and time again and just a few jobs can recoup the outlay.
Door to door leaflet drops are too unreliable and usualy a waste of time and effort, you have no control over where they are put if inside a free paper , you could do solus drops but this would work dearer in the long run than the above and with out the results.