Currently Being ModeratedMar 6, 2013 1:24 PM (in response to Jeff Hickey)
Try unsupervising a device and supervissiong it again. This will force Apple Configurator to download the latest iOS update and may fix your problem. When preparing a NEW device it always tries to download the latest iOS update.
the .ipsw file are now in ~/Library/Containers/com.apple.configurator/Data/Library/Application Support/com.apple.configurator/Resources
But I wouldn't mess with those