Check out yawaonline.com. They have NHT speakers...and you shouldn't pay more than what they have posted, in fact if your bidding you should pay much less. My recommendation would be to buy it through yawa unless you could get the pair at least $50 cheaper. I think saving over $50 might make it worth it to go through someone not commonly known. Otherwise I think that yawa's customer service and great reputation is worth the $$$ you might save going through someone you'd pay $20 less to; but YMMV.
Just for comparison, the NHT SB-2 is available from J&R for about $265.00/pair shipped. The SB-2 is the replacement for the SuperOne. J&R is an authorized dealer for NHT.