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There happens to be 3, SS2 subwoofers on US AudioMart if you are interested, two in PA and 1 in NY. I was concerned about the Thiel SS Subwoofer cause there doesn't seem to be any repair for them when they fail, same thing with the Integrator.
I have read good things about REL subwoofers, I haven't looked into these but look interesting. Vandersteen has the Sub-Three that has the 11 band Eq built into the amp and uses a feed off your amplifer to provide a signal to the subwoofer, these were designed to sit in the corner of the room and take advantage of corner loading to work their best. These are the two that come to mind for music oriented use as opposed to boom shake-allda home theater subwoofers.
It would be cool if someone could find a way to repair the Thiel SS subwoofers.
If you find something interesting let us know.