IF you have DD214 and post access then go to PX instead and when they have 'em on sale, usually $50 off, you can get 'em for less than the blue label deal and there's no tax either. I think I paid $425 out the door for a new G26 few years back.
Other stores will extend deals and sales to veterans and active duty all the time, as a matter of course, and so I tend to stick only with those dealers. Given how many dealers and such there are out there, if you're a veteran and you're not getting at least 5-10% off on everything you buy year round, you ain't been shopping around.
Some high end mfg.'s will give you military accounts (Oh and do I have one I covet like a motherfucker too) others will give you 30% discounts and defer costs to non-veteran/military customers to make up for it! Always worth asking if they offer the discount.
PS, when sending copies of your DD214, use "that other" copy if you can and make sure to tape over your SSN before you run it through the scanner.