I am going to post this as an idea.
You can run a pc fan off a usb cable. Strip the usb cable and match black to red with the fan and it should power on once plugged in via usb. I am not sure how many you can run per cable, but that can all be tested. I was going to attach all of the fans to a piece of eggcrate, and fit the crate on the inside edges of my wonderfuge, so it rests there without moving. Then take the usb cables and plug them into a powered usb hub. This means you only have one power cable for the whole setup. If a fan goes out, it is easily removed and swapped.

Granted it's not the cheapest way to do it, you could just run individual power to each fan and plug them into a power strip, but frankly, I hate daisy chaining them, because I do not trust them. I just thought I would share this idea, you can buy supplies to do four large 120mm fans that are silent, for about 80-100 dollars. I am going to use spare stuff from around the house, which is cheap