Rock-It is from Orly's Mineral FX collection that came out last fall. I honestly can't even remember where I got it because its been sitting in my untrieds drawer for so long. I grabbed it and just went for it.
Then I decided to layer Ozotic Mish Mash 531 over it. I received 531-534 from piCture pOlish during one of their Facebook giveaways & I'm so happy. I <3 them all.
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Sadly, Ozotic 531-534 have been discontinued so I'm not even sure if you can still get them anywhere. You can check the piCture pOlish website for the various network members that sell their polishes to see if they still have any available.