Sigma ProConnex 3/8-in Flexible Die Cast Zinc AC/Mc Connector Conduit Fittings (10-Pack) in the Conduit Fittings department at Lowes.com
Halex – 3/8 Inch Flexible Metal Conduit (FMC) AC (BX) Connectors– 05803B – 100 Per Pack – Silver - Audio Cable Connectors - Amazon.com
Electrical Fittings - BX/Flex/MC Cable - NA Industries International Corp.
AC-MC-FMC FITTINGS – Tagged "BX" – Electrical Resource International
Connectors and Couplings | AC/MC Fittings | Eaton
Commercial Electric 3/8 in. (1/2 in. knockout) Flexible Metal Conduit (FMC) AC (BX) Connector (100-Pack) FFCBZ-38-100 - The Home Depot
BX, MC, ARMORED CABLE FITTINGS | Granite City Electric Supply
TOPAZ 130 CONN. BX SET SCREW 3/8IN 100/CA | Gordon Electric Supply, Inc.
Bx-Flex Straight Connector Set Screw Type Zinc Die Cast 3/8' UL Listed - China Bx Connectors-Set Screw Type, Bx Connectors-Set Screw Type L16 | Made-in-China.com
3/8 in. Armored Cable Connector, .402-.610 | 38RAC | Raco