A couple months ago, maybe even early Feb, it was on the Saks website under the Spring Handbags section for Prada. Maybe it sold out on Saks.com, but I've seen it pop back up twice in the past couple of months
And in December, my NM had it in the store (the all black nappa version), but I don't think they still have it anymore.
Sailormom, I saw that mini in Prada about two weeks ago, so it seems they have it still. I think it was about $450.00 USD. I think it's adorable and I was considering it when I saw it. (I only passed because I have the clutch.)