Sage EBR chassis is 700 bucks from Sage, mine was 350 from craiglist, i assume it was a bringback, that was common early when units mod'd their own m14's they would put wood furniture back on them when they turned them in post deployment. I paid 1500 for the rifle, the Aimpoint Pro Patrol i got at cost for 325.00. Vortex hider was 130, buttsctock was 60, grip was 20. Probably 3 hour of labor as you have to take the entire rifle apart to include the gas system and some of that was a pain (factory op rod block).
not cheap, but i think the springfield platform is the best battle rifle on the planet. If i was on a budget i would do an AK like Shotgun News did few months ago.. I like AR's for plinking but i wouldn't settle for less than a .30 cal off the range.