i think the gunbroker deal is about right for night sights...
Bud's has the deal for $399 now for the 9mm/.40 without night sights, but without that deal, sans night sights, you generally find them around here in the $450 range....$75-100 is pretty typical for a complete set of trijicon night sights on a pistol, which puts them at $550 or so with the works...
that is what I have seen them at...
I just order a M&P .45 for $600 shipped to me...maybe I could have gotten in $40 bucks cheaper or so...but you knock off $40 for shipping, that means I paid $560 for one with night sights....thats about what I have seen them advertised for around the net, pre-being in stock....I maybe paid $20-30 bucks more...
combine that with the fact that we havent even caught a whiff of them around here, and I am fine with that to have mine Monday, especially considering Ive been wanting one of these damn things for almost 5 months now...