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I'm also looking for something like this. I see some on eBay for about $3.99, but I'm not sure I trust it. I know the Rocketfish Hard rear shell I had for the 1st gen mini doesn't fit the retina.
 
Lots of cases on Amazon if you look. I have been testing out the i-BLASON on my Air for the past few days and I am really liking the hard shell version with the anchor locks. It's more than three bucks, but how much was your Mini? It's worth the cost.

i-BLASON Apple iPad Mini with Retina Display Case (2nd Generation) Hard Snap On Slim-Fit Case (Smart Cover Compatible with Smart Cover Anchor Lock) (Clear)

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