link - http://www.parts-express.com/dayton-audio-18-ultimax-subwoofer-and-cabinet-bundle--300-7099 Its been out of stock for a long time, I suspect because Mark Seaton bought all their stock for his new sub which uses this driver. But everything I read about it is great, and it beats any commercial sub 2-3x the cost. With a iNuke amp total cost should be <$800. I really don't see why some would need a ported box for this for home use.