Reddit mentions of Amamax Wall Adapter Power Supply - 12V DC 2A, 5.5mm - 2.1mm UL Listed

Most 140mm case fans should only pull 1-2 watts.
http://www.xbitlabs.com/articles/coolers/display/140mm-fan-roundup_12.html

A small wall wart should do it. I'd just repurpose something I already had, but something like this would do it:
http://amzn.com/B00KZ2ZQE8

Also going down to 9v might be an option for this setup as it would make it quieter at the expense of slower fan speed.

I use two of these when I bring my Vive places since the original power cables are in the wall: https://www.amazon.com/gp/product/B00KZ2ZQE8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

They work fine.

When I was first trying to get it to work, Radioshack was trying to get me to pick up two battery packs which held 4 AA's each. I didn't want to deal with that so I found a charger online and hardwired it into the LEDs with a small switch.
Here's the charger I used

http://smile.amazon.com/gp/product/B00KZ2ZQE8/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1I mounted a

I also picked up a heavy duty mountable surge protector that I mounted on the back so I would have a convenient place to plug in the fan, freezer and LEDs. This is what I picked up for that one.

http://smile.amazon.com/gp/product/B0000513O4/ref=oh_aui_detailpage_o04_s02?ie=UTF8&psc=1

This BIGGEST thing to remember is to make sure the volts and amps are enough in the plug in you are using. My LEDS need 12v and 2 amps. As far as I know, it's ok to have more amps than you need, but don't go over on volts

ohh yes I forgot it's not included. You're going to need a power thing for it. I heard this works well. Keep in mind that you will also need an extra HDMI and USB (male to male) cables as well.

I think it's really silly they don't include them with the box to be honest.

https://www.amazon.com/dp/B00KZ2ZQE8/ref=cm_sw_r_cp_api_QIbMxbNFX0YHC This adapter has been reported to work.

Tube amps have different terminology than I'm used to (filament what now), but it looks like it needs 12V 2A minimum to be safe. You could use anything from a wall-wart like THIS to a custom built DIY amplifier power supply.

They are 2 exo-terra tanks - 24in wide x 24in tall x 18in deep. The fans are these 'Gentle Typhoon' bad boys I saw other people recommending on orchid forums. I've had the oldest running since mid 2016 24-7, no issue. They require a little simple wiring - I bought plugs for them like these.

Awesome response, thank you!! Follow up question: Lets say I used this guy http://www.amazon.com/Amamax%C2%AE-Wall-Adapter-Power-Supply/dp/B00KZ2ZQE8

Could I simply strip off the barrel jack (which would leave me a power and a ground wire), then branch two wires off of the power wire to power the arduino and both steppers?

I need to make it work off of one dc converter from my wall outlet. Perhaps a better way to do it would be a barrel jack splitter, if that exists?

Sorry, but I don't completely know what I'm doing. I sent HTC an email asking about getting a return on the adapter, but I think it's going to be exponentially faster to just order one.

I found this one online. Do you think it would work? The one for the Vive has the same input, and the output is 12V 2.5A LPS

Can't completely tell by looking at the picture whether or not the jack is the right size.

Hey, sorry to hear that you had so many problems and were unlucky to get 2 bad Vive kits. If you are 100% sure that the cable is kaput, maybe consider getting a different power supply for cheap in the meanwhile if you don't want to bother with the HTC support anymore:

https://www.amazon.com/dp/B00KZ2ZQE8/ref=cm_sw_r_cp_api_QIbMxbNFX0YHC

Here someone else has already tested those successfully: https://www.reddit.com/r/Vive/comments/4usa5w/extra_base_station_ac_power_adapters/