Pm me, I have 6 of them. I would be willing to help you out if you only want one or two, I will give you the price I bought them for. Send me a message and we can talk about it.
Never seen them locally and they are going for a lot of money on gunbroker.com, etc., but Ruger currently has a Father's Day special with free shipping on orders of three or more magazines. My email said that this was good until 6/30/13!! Also if you register a new Ruger firearm on their site you get a special code for 20% off accessories, including magazines.