Master Lock Combination Bike Lock, 4 ft long – Link

This is currently marked down to just $3.18 on Amazon.

• Bike lock is best used for basic security as a theft deterrent
• Preset four-digit combination bicycle lock for keyless convenience; combination cannot be changed
• Bike lock cable is self-coiling and features braided steel for strength and flexibility
• Protective vinyl coating prevents the cable from scratching your bike
• Bike cable lock is 4 ft (1.2 m) long with 5/16 in. (8 mm) diameter cable (includes vinyl coating)