Advertising.
This can be on radio or television, in newspapers or magazines, on posters and billboards, or by using leaflets handed out in the street or delivered to homes.
Point-of-sale displays.
These are special displays of a product or range of products inside a shop. In addition to the products being on their usual shelves, they are displayed at other locations, often, in the case of supermarkets, near the check-out area. A printed cardboard display stand will be used, possibly with posters and banners, which can be displayed around the shop.
Coupons.
Manufacturers sometimes include coupons on their packaging. These can be used by consumers to get a reduced price on their next purchase. Coupons can also be included on leaflets. The use of coupons does, of course, require the cooperation of shopkeepers, for whom collecting the coupons and returning them to the manufacturer for reimbursement can mean a lot of additional work.
Tokens.
Another technique is to include a small token on each packet or container. When people collect a specified number of tokens they can take them to the shop or return them to the manufacturer to receive a gift. Again, such promotions often require the cooperation of the shopkeeper.
Special prices. Reducing prices can be used as a short-term promotional technique. However, it is not enough just to cut your prices and have your product on sale for less -you have to tell people you are doing so. Thus price reductions have to be used together with other promotional techniques, such as advertising, and in-store displays.
Free publicity.
Local newspapers and radio stations often look for local news items. They may be very pleased to do an article about your new factory.