MGM Targets offers a T-Post Package that comes with a hanger and an 8-inch steel plate, for $80. MGM even sells a steel protector for $178 that covers and protects the T-post from bullets.

GADFISH AR500 Steel Target Combo Set, 3/8" Gong Target Hanging Kit, Outdoor Hanging Gong Targets with 10 Pcs Paper Targets, ... INCLUDES: Caldwell AR500 steel target (hangers sold seperately) ...

Ar400 Steel Targets for Shooting - 4 Inch X 3/16 Inch Steel Target - for 22lr Rimfire Airgun Air Rifle Plinking - Small Metal Targets for Shooting - Gong Targets for Shooting - Shootingtargets7 ...