This is a good deal, especially for the free shipping. Batteries are HEAVY and usually cost an arm and a leg to ship, which is why I usually recommend buying local. This is a great price, and no pain with the free shipping.

APC BE750G 750 VA 450 Watts 10 Outlets Power Saving Back-UPS ES – $88.99 (w/ $12 off code “APC423″) + Free Shipping at Newegg.com, exp. 4/30

If you have a workstation, or a group of networking equipment (router, switch, modem, wireless, etc), you should have one of these. It regulates the power feed to these sensitive devices, allowing them to last longer, and not die power-related deaths. It also gives power to them in the case of a power outage, allowing you to save your work (on your workstation), run longer on your laptop, or keep your network stuff up during a power blip.