Best ways to market small local business?

Hi,
I own a small computer repair company. I have been using a few advertising methods such as leaflets and just yesterday started a Adwords campaign. Leaflets are becoming too expensive as the area i'm in costs a lot to produce them.
What other ways have you found works well? I am considering sign writing my van or putting a large advert on the local supermarket window which receive a high amount of foot traffic.
What do you think?

See original post by scott2342