"Cross-Stones Of Armenia" Silver Commemorative Coins

I'm looking for more information on the release date and where I can purchase a set. All of the articles I have found are from October of 2011 and just say the CB issued them. I haven't found any sites selling them yet so I'm not sure if they are actually available to the public yet or not. The CB's web site just gives a listing of each coin and its description but no purchasing information. There are 5 coins to the set: "Cross-stone of Kecharis," "Cross-stone of Sanahin," "Cross-stone of Goshavank," "Cross-stone of Gndevank," "Cross-stone of Etchmiadzin," and "Cross-stone of Noravank,". Any new information is greatly appreciated.