USALight.com offers commercial magnetic indoor and outdoor transformers.
Part Number: ETR12Wattage - 50wInput Voltage - 120VOutput Voltage - 12VLength - 2 1/4"Width - 1 7/8"Height - 3"UL Recognized.
Part Number: ETR277-20Wattage - 20wInput Voltage - 277VOutput Voltage - 120VLength - 2 1/4"Width - 1 7/8"Height - 3"UL Recognized.
Part Number: ETR-277Wattage - 300wInput Voltage - 277VOutput Voltage - 120VLength - 2 1/4"Width - 1 7/8"Height - 3"UL Recognized.