Here's the headphones I got them from:
http://www.radioshack.com/product/index.jsp?productId=2102551Only they were $65 when I got them last Christmas:( and they broke very easilly:(
As for the speakers themselves, they look like the large one on the right of this picture:
Also when I said the speakers were very good, I meant they sound good when you hook them to an amp. They crack a bit at really high volume though.
And to seal off the back of the speaker, just take some plastic tubing and attack it to the back of the speaker. Then cut the tube short. Last, plug the oposite end of the tube with a circle of plastic. I found that a large 81mg bare (I think that's how you spell it) aspein container works well. It the exact diameter of the speaker.