http://www.bestbuy.com/site/olspage...t&productCategoryId=cat08029&id=1091101368673
On sale today only. $50. Decent power. Store brand, probably an APC or Cyberpower. I have a few of both, the APC's batteries are still working after 5+ years, the cyberpower batteries got weak after about 3 years and were shot at 4.
Remember you have to put your cable/dsl modem, your router, your VOIP box and your phone on it. Or keep a $5 unpowered phone handy to plug in.
At this power level, you'll get about 25-45 minutes, maybe a little bit more, depending on how power hungry the gear you plug in is...
Under some power outage circumstances, cable amps may also lose power, and they often dont have the battery backup or alterate power supplies that DSL phone equipment does.
Lastly, most of these have a shrieking screaming noisemaker in them, which frequently cant be turned off. My APC's have a switchpack on them that allegedly turns them off, although it doesnt. The Cyberpower can be USB connected to a computer and configured, but loses its configuration if you unplug it for a while.
Nothing a soldering gun didnt fix on either, as something screeching at you in the middle of the night isnt my idea of a good time. Yeah, go ahead and make your own joke...