@Legion JD posted:
Without having to make one, is there a good 4.5v dc power supply that will power a dozen or so Menard's buildings?
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While you undoubtedly mean a dozen "average" buildings, Menards now lists power requirements for their buildings. Finally!
The point being it should only take a minute or two to do a quick back-of-envelope calculation to estimate your power requirements. I find the World HQ 5,000 mA somewhat hard to believe, but taken at face-value that's a whopping 22 Watts. 
Put a dozen HQ buildings to model Manhatten and you're talking 60 Amps! Anyway, you get the idea.
Separately, if you review search earlier OGR threads, most guys drive the Menards buildings at less than 4.5V. Maybe 4V, 3.5V, or even less. It's personal preference. If this is of interest, suitable diodes are, say, 10 cents a piece and are an economical way to fine-tune the brightness of a particular building or cluster of buildings. Each diode drops about 3/4 Volt and you can put multiple diodes in-line (in series) to drop more.
