Advertising materials or products can be given as a good gift for business owners. This way not only you're self advertising, you're giving out items which can be useful for others. Let's say you give away fridge magnets, notepads, mousepad, keychains, shirts, caps, etc. these are things that people commonly use and are very effective advertising tools. However if you're advertising for online business, advertising agency can do the trick for you.
It doesn't matter how small or big the item can be, whatever it may be make sure it is something useful and handy. This way people can easily access it and use, having it this way can promote more business exposure. These items can also be referred as souvenirs, and who doesn't want any?