This deal has ended.
Originally $725, then on sale for $350, One Call now has the 12" Elan Home Systems THP1200SW Subwoofer priced at only $318.97. This features a three-layer honeycomb composite woofer in a cast aluminum basket and can put out up to 300 watts. Shipping adds $52.50, but it's still the best price even with that. There is no sales tax (except ID, WA, WV).