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Benedikt Eppelsheim Wind Instruments in Germany produces a rather amazing sounding instrument called a "Tubax". The Eb version sounds at the same pitch as an Eb contrabass sax, while the Bb flat version sounds a fourth below that! To my ear, it's not quite as beefy sounding as a contrabass sax, but has a little more oomph to it than a sarrusaphone.

Manufacturer...
http://www.eppelsheim.com/eppelsheim-bl ... mente.html

This sample clip comes from a music distributor's website, and features a group from Germany:

Clip...
http://www.daveamason.com/tubax/in_the_speed_mode.mp3

Group...
http://www.wollie-kaiser.de/timeghostho ... phonmafia/
http://www.wollie-kaiser.de/timeghostho ... stand.html

Contrabass.com has information on it, and links to several sites featuring pixx, sound clips and even a couple movies:

http://www.contrabass.com/pages/tubax.html

What a cool sound!!

...Dave