JR.com has the Logitech AudioHub Notebook Speakers 980-000101 for $54 - $40 rebate [Exp 9/8] + $7 shipping = $21 shipped. Includes speaker system USB hub, and cable control. [BizRate]
I bought these last time and I do not recommend them especially if you already have a x.1 set. This set is weak in both max volume and bass. I recommend you to save your money and get something better.
Good Geeky Idea but Sound Quality not so great from Amazon Reviews.
http://www.amazon.com/Logibacon980-000101-AudioHub-Notebook-Speakers/dp/B000UY1MB2
I have a little set of Philips PC speakers, still rocks after almost 10 years.
I bought these last time and I do not recommend them especially if you already have a x.1 set. This set is weak in both max volume and bass. I recommend you to save your money and get something better.