Using the search term “4.5vdc power supply” will show you a large number of options from $3 to $20 or more. So pick the one(s) you like with “free shipping” added in, I suggest. Also, to Stan’s point above, at the necessary 4.5vdc, pick an amperage that will power all the leds(buildings) you want with the least number of units. I would think a minimum of 1 Amp(1000mA) per power supply. Depends on the buildings but as has been reported the building requirements on current vary. Some buildings with variable signs and the like might require up to 5A supplies. In my application, I use a single power supply to terminal strips, then use buck converters to regulate each(or more) buildings to suit my taste. Which runs much less bright than yours BTW. So make your best deal and “go to town”.
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