Don't know about S&W, I waited for the extended Black Friday sales...one day it was a Aero Precision, Magpul furniture lower that was about 60% off, another day it was an Aero Precision upper/22", two bolt hook up. Did the same with glass, one, BCM, sports Leupold fire dot and the AP is a Vortex mil rad scope.
Armasite currently has some decent quality thermal sights at 33% off, work the sales if you can.
Worked the sales for a Bravo Company lower and upper.
There were also 6.5 Creedmoor ammo and brass on sale and bulk Magpul magazines...it was a good Christmas.