Looking for a compact subwoofer

[Craven Sound]

I have a few small jobs coming up and I want to add just a little low-end punch. I already have some single 18'' boxes, but want something even smaller. (think sedan sized) I would prefer active, but might also consider the right unpowered box if it were exactly what I was looking for.

[floodcitybrass]

Yorkville makes some active small subs in the 200-300w range.
Pianos N Stuff rents them if you are out that way.

[Craven Sound]

I have a set of Yorkville ls608s, and they're a great compact 18 and would love the 2x10 active sub, but it's pretty pricey as a new piece. I was hoping for a used piece that somebody was looking to sell.