^Aww, that sucks. It's usually the classic colors that sell out the fastest. However, those are also the colors they tend to restock more often. Maybe you could check again and ask when they're getting the next shipment.
As for similar designs, I've already seen a bunch online and on the street of clubmaster look-a-likes. Since Ray-Ban's pushing for these to be this year's big thing, copycats are bound to be everywhere.
__________________ Give a girl the right shoes and she can conquer the world