You could look for a combo system. I found a home theatre system that connects to both my tv and my computer. I purchased mine at walmart and it is Memorex brand I believe.
I have a set of creatives connected to my computer. I have the small speakers as well as the subwoofer. I think I talked about this is the other forum topic. But I actually enjoy both the speakers and the subwoofer. They didn't cost me anything but 100 bucks.