Gogeardirect has this Aero BCG for $143. GEARUP10 at checkout for 10% off plus free shipping.
https://www.gogeardirect.com/ar15-bcg-bolt-carrier-groups-selectable-caliber-and-finish.html?avad=211021_e214a4641&utm_source=avantlink&utm_campaign=35987&utm_medium=affiliate&utm_content=Custom+Link
They probably won't last long.. $490
Aero Precision Complete Upper (no BCG/CH)
https://www.aeroprecisionusa.com/m4e1-threaded-16in-556-m4-complete-upper-atlas-rone
Looks like they still have black in stock