I'm all for supporting LGSs however mine starts at MSRP and goes up from there. With the only other (and smaller) GS in town following his lead and pawn shops being hit and miss, I've found the online dealers, and in some cases a Gun Show that comes around a couple times a year, to be my best bet when buying firearms.
That being said, since the gun-buying craze has ebbed he seems to be more open to negotiating, and my last gun purchase was from him when he came down $89 on an overpriced Beretta.