Everbilt Assorted Color Locking Carabiner (1 carabiner per order) 43474 - The Home Depot
Locking Carabiner Buying Guide - GearLab
Amazon.com: Outmate Premium Aluminum D-Ring Locking Carabiners (Pack of 6) - Lightweight & Durable for Hiking, Camping, Keychains, Dog Leashes & More - NOT for Climbing : Sports & Outdoors