Locking Outlet Covers for IV Pole Mount Receptacles
USW 12/3 Twist to Lock Multi Outlet Adapter 3-ft 12 / 3-Prong Indoor/Outdoor Sjtw Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com
IEC320 C13 PDU Outlet Lock Yellow - Converts standard C13 outlet into a Lockable outlet securing a C14 plug
Amazon.com : Baby Safety Outlet Cover BOX [Patent Pending] Double Lock for Much Better Toddler Proofing, Easier Operation, Simple 3 Step Install with Included Screws. Provides Extra Space Inside for Plugs,Adapters :
Ohio Medical 261697 - Simplex Electrical Receptacle, Twist Lock, 20A