$56.99 Genie 1022-TH 1/2-Horsepower DC ChainLift Garage Door Opener with Two-Transmitters - Chain Drive 
Craftsman 1/2 hp Chain Drive Garage Door Opener 53920 Reviews â Viewpoints.com
Chamberlain C203 1/2 Horsepower AC Chain Drive Garage Door Opener - Walmart.com - Walmart.com
