what would be the best way to advertise a business with no extra money??

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I have my own business that i do through my home.. I set it up for my brother who is in prision so it was intended for inmates. It is a penpal site as well as gifts that we make at home through arts and crafts or baskets and such that we put together and we send the inmates brochures and such an then they can purchase them and we ship them to there loved ones. . we have recently started expanding it through other online sites and making advertisments and brochures to get the word out. so that we can get other customers as well and not just inmates.. What would be the best way to go about doing this with little money.. I know that it takes money to make money, but its tough to have moeny for a business if the business isnt bringing any in... any thoughts on how to go about doing things that will broaden our customers? thank you in advance!