I'm looking to build a new subwoofer for a home theater, to replace a now-defunct tempest (doh). It seems like the sub driver market has dried up! I was hoping to grab an Avalanche 18". I'm very flexible on box size (IB is out of the question), and would like to stay under 1000w of power. The AV 18" I could wait for, but shipping to my location (Hawaii -- no ground shipments) would be over $150 bux via air (FedEx). What's the best I could do for a ported sub that goes low (e.g. < 15hz with moderately decent SPL) with a driver that I can actually get right now? I'm thinking I may have to use multiple smaller 15" woofers in a single box, but again, there isn't much I can find that is available outside the Dayton/PE drivers, which are looking overpriced right now. Are there any other options I should look into?