I, too, would post a WTB ad on here. You'll most likely receive a gun that has been well taken care of and maybe even some "extras" that wouldn't come with the gun in a retail shop. I can't wait to get to 50 posts to put up my own WTT/WTB/WTS ads!
I think Plainfield Shooting Supplies would have the lowest prices on Glocks in the area. I have always found Bradis's prices to be a little higher than PSS. Bradis is my second go to spot. The prices there are reasonable.