Go to Miller Engineering they make three products perfect for Menards/Woodland Scenics buildings.
AC adapters
Now you can replace the 3 AAA battery pack that comes with your
kit and use one of our wall mount AC adapters. Available in 2 sizes.
#4802 - 4.5volt AC/DC adapter, will run up to 3 signs $7.95
#4803 - Large 4.5 volt AC adapter will run up to 10 signs. $16.95
Converter Module
#4804 - Converter module. $12.95
This unit will replace your battery pack. It will let you run your signs off track voltage or your power pack. Accepts an input voltage from 5 to 17 volts, AC or DC and outputs the required 4.5 volts for our signs. Will run up to 6 signs.
I believe Menards has a power supply but it's unregulated.
Dan