We have found that leaflets and letting people call you, 99% of the time mean that they really do want your service and they will tend to stay with you longer, but yes the response can be slow, we took on one the other day, she had kept our leaflet for 18 months as she knew she was having new windows put in last November and liked the look of us! Have never tried post offices, but if they are the middle of an estate it could be good. Hairdressers, try and take on the hairdressers windows, once a week insides and outs, make sure you visit when they are full of customers, and it may just be that they will become your customers too! One tip for picking up commercial, tout your domestic customers, some must go out to work somewhere. May be one month, just do a flyer of your own, saying "We take on Commercial properties too!,Would your place of work benefit from our services? Please feel free to pass my details to the relevant person or call me with the details and I will make contact" This is basically cost effective and easy advertising. Again it has worked for us, but may not work for others. Just one thing , commercial work is a totally different area to get into than domestic. Make sure your quantify all details in writing and get either a signed contract or work on purchase order terms. Be prepared to wait for your money. Chase them regularly once the terms have passed.