I did, and it seemed like a good solution, except I wanted to be able to instantly get the price info, and town crier is a request/response method. The Price Oracle part of unum caches the price, so I can use a .call method from the Unum contract to retrieve the data immediately.
Everyone and their mother is starting an alt-coin.
My next-door neighbor's sister's hairdresser has started one as well. Every 10th coin you mine, you get 15% off your next appointment. Have you looked into that one yet?