Best place to get a mosin orig sniper?

Right now? Probably RGuns ($800) or the private market ($600-$750 depending on exactly what it is and it's condition). I think you're about a week too late for the $600 examples from J&G. Keep in mind that all of these are going to be refurbed rifles, so "matching" scopes were usually put on them at the time that they were refurbed, their original scopes being refurbished and put on other rifles, as well. They usually still stamped/EP'd the rifles to match in some way, but not always.
 
Day late and dollar short I just sold a nice matching from the butt plate to magazine 1943 one from Randell Bessemer from 1992. Good luck in you're hunt.