I have met several potters who are making pieces at home and taking them to a friend's house, or community studio to fire. While a used kiln may be found on Craigslist, or other social media sites, you may find that financing a brand new kiln will allow you to proceed with your creative process.
Clay King in SC offers financing for small pottery businesses through North Star, PayPal, and a financial group. http://www.clay-king.com/specials/kiln_financing.html
There are other vendors on line that will do the same.....check them out.