These sound really good, but they aren't cheap. These Bose speakers are smaller than a Rubik's cube, but will rival the sound of a small home theater system (without the rear surround sound speakers). The stands are removable; and, with a little imagination, can be attached to (or mounted near) your flat panel TV. It's not immediately obvious, but this system includes a subwoofer.
BoseŽ CompanionŽ 3 Series II Multimedia Speaker System
1. You may also need a small inverter (if your Interstate is not so equipped), because these need 100 watts (max) of 110-volt AC power.
2. I have no affiliation with Costco, other than being a satisfied customer.