Thank you so much for the suggestions- I ordered one from Radioo Shack. You guys are the best!
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Too late for you, but I like the Samlex America inverters. They put out a pure sine wave, which is considerably easier on whatever you plug into it. Square wave inverters can actually damage some electronics, and will destroy electric motors, but battery chargers are usually OK. They also have a cooling fan. Expensive, but they're the good ones.
For multiple outputs, just pick up one of those 1 to 3 pigtail adapters they sell at hardware stores. Not the plastic ones meant for plugging into a wall socket, the cabled ones made for adding multiple extension cords to a single outlet extension cord.