USB Pluggable speakers for Macbook Pro 13" Late 2011? What are some good USB plugged-in/pluggable speakers for Macbook Pro 13" Late 2011?

My MacBook Pro late 2011 has its headphone jackets broken due to a stuck headphone jack, and my warranty's out. Also in the sound pane the sound output device listed is "Digital Out"

So as my headphone jack is out, and as I don't have a compatible "Digital Out" device, I'd like to know if there are any USB Pluggable speakers available which function by getting plugged into the USB port instead of being plugged into the headphone socket.
I can recommend the 'SoundSticks I' from Harman Kardon, a very good 3-way Sound System. The first Generation had an USB-Interface, the later Models had the usual Headphone Jacks. You can get it from E-Bay, usually for less than 80$.

One important thing: You cannot use them on a USB-Hub, you have to connect them directly to you machine.