If you've been holding off on getting a Vita because of the price, I think the deal you're looking for is coming up
Short version: White Vita, 4GB Memory card, copy of AC Liberation, copy of Playstation All-Stars, and 30 days of Plus - $179
It'll be on Amazon's Gold Box deals tomorrow (November 23rd) at 12:00 pm PST
I don't think you're going to find anything better than that.
Edit: If any of this info seems confusing, here is another thread that's trying to clear up confusions.