Computer stores for UPSs (Uninterrupted power supply). Hardware stores for generators and Crappy Tire has some nifty power inverters as well. UPS and inverters may only last you a few hours depending on your equipment and the size of your tank. Generators keep going as long as you keep putting gas in, but can be quite noisy unless you get a nice Honda or Yamaha in which case your looking at quite a bit of $$$.
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