New Gen 3 Glock 21 with mepro nite sites for $699.00 (+ uncle sams cut)
It really depends on your area. Glocks here are about as cheap as anywhere and I could probably get that 21 for 550 w/o the meps, probably $630 w/ the meps. Heck, even in VA prices vary. My local shop wants 650 +/- for a NIB 21 w/o night sights.
That could be the going rate in your neck of the woods.