I have a Sony SA-WM40 12" subwoofer for sale, price is $115 + actual shipping (probably around $30 UPS) or pickup. I am willing to trade for a used/new Tempest driver (there must be someone who started a DIY and never finished). The sub is less than 1 year old, and in very good condition. Pictures are available (slow uplink, but works) at "http://szollinger.gotdns.com/Pictures/index.php?album=Sony". Feel free to email me any questions. Thanks.