One of the cheapest, best value ways I know, is to turn your Business card into a Magnet.
Whilst business cards are a fairly low cost item at approximately 10c each, full colour business card sized magnets ( printed rubberized Magnetic material ) is usually around the 30c each mark.
Fridge magnets (or filing cabinet magnets) are a well known very cost effective way to build your branding into homes, offices and kitchens. Their low cost effectiveness is due to repeat exposure. The repeat long lasting exposure you want generating greater customer loyalty and sales from both new and existing customers.