Not sure if it's a "deal" but Quentin Defense has a complete upper with BCG in stock.
CMMG M4 upper half.
Specifications and features:
5.56x45 NATO chamber (accepts .223 Remington).
14.7" Chrome Lined Barrel, 1-7 RH twist.
Permanently attached A2 Flash Hider.
Direct Impingement gas system.
Forged flat top upper receiver.
Standard F-marked front sight with bayonet lug.
Complete with AR15 bolt carrier group and charging handle.