Magazines and other Publications
You can consider advertising yours in a magazine or a newsletter. Even better, you could try to have yourself featured in an article in your local paper or a craft magazine. This way your potential customers will learn more about you and the back-story of your craft. With crafts, a lot of customers like to know the process and story behind its creation, so this is an excellent way to connect with them and generate more interest in your new venture.
Just a few years ago, there were very few crafters online. Now, you can have a website devoted to marketing your rubber stamp creations. A website that displays your products and provides some background on you and your craft can also be a really effective marketing tool. You can also sell your products directly online. This will allow you to sell your products to people all over the world with minimal advertising costs to you. Just think of the exposure!