Computer speakers
These might do it: Alesis M1 Active 320 USB
These might be perfectly good speakers. But...
You're going to have a heck of a time getting 20W RMS [sic -- there's no such
thing as RMS power] out of them, as a USB interface can provide no more than
500mA at 5V. And this 2.5W has to be divided between two speakers!
Granted, most speakers can put out a listenable SPL with 100mW (or less). But
you're not going to be able to play them at high levels. At least the
expensive Vers speakers I mentioned have their own batteries.
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