$325 would be a great buy for one in that good of condition. They are selling in my area for $425 with only one mag and they're not nearly in that good of condition. If the seller won't drop to $325, I wouldn't have a problem paying the $350.
Don't tell me where that one is or I'd be tempted to buy it!
I guess it's just proof that it all depends on the market. Those are moving in my area like hot cakes. My father in law just sold one with 3 mags and the Sig custom wood grips for $500 and people were practically pushing each other aside to look at it at the last gun show. And it still wasn't in the condition as the one in these pictures.