I've been looking all over the net and it seems very hard to find subwoofers that are not powered. I have a nice NHT subwoofer amp available to me and I'd like to find a subwoofer to use with it.

I can't afford a very expensive speaker and all I see on ebay right now is a beat up 8inch NHT. Even subwoofer kits are all powered as far as I can tell.

Any suggestions?

Yamaha RX-V2700 / CDC-815 , Oppo DV-980H , Axiom M22s , Paradigm DSP-3100