I had to replace stolen computer equipment last year at this time. I picked up two sets of speakers for $20 each at CompUSA. Bear in mind, if you want a system to broadcast to the whole house, or even a very large room, this isn't it. But if you want nice sound when you're working at your computer, this set with three speakers this is fine. Mine may have been on sale at the time, but you'll find these at $30 tops. They're two different brands and are slightly different in design, but consist of two smaller speakers and a larger central one (more bass from it). Both of these sets plug in, they aren't powered by the computer. They don't have any batteries.

They don't seem to have names, but stores like CompUSA will be bound to have something comparable.

SRS