If its single-stack, I'd guess that its a .50 Action Express with a grip that wide. I believe its double-stack and that's what Tsquare was eluding to when saying that it was difficult to load.
Sports World in Tulsa has one for $518 on the tag. Not sure if that is negotiable or not. I was looking at it yesterday, trying to decide between it, an Xd subcompact, G26, or a Kahr.
500-550 is the going rate IMO its a lot of money but damn that thing is accurate and small. I have been trying to decide between three guns for my concealed to carry 1st XDM compact hold 20 rounds, 2ns PX4 Storm Sub Compact, & 3rd S&W 642 ultra light