RadioShack's website is selling both the Wi-Fi and the 3G/Wi-Fi models of the PlayStation Vita for $159.99 with free shipping. This sale is only good online, and it runs until November 16. Unfortunately, it looks like the 3G model is already sold out.
This is a pretty sweet deal even for just the Wi-Fi model, and if you have been holding out to get a Vita this might be a good time to grab one.
Wifi, 3G/Wi-Fi PS Vita $159.99 w/ FS @ Radio Shack [Cheap Ass Gamer -- Thanks, Jacob!]