3000VA Control Transformer, 440/460/480V to 120/24V | ATO.com
SV Single Voltage 240V to 24V Transformer 25VA
Maxdot 24V 40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Doorbell and All Versions of Ring Doorbell (1 Pcs) - Amazon.com
200W LED Driver Power Supply Switching Power Supply LED Transformer 220V to 24V | eBay