The USA Retail Price is $2300. 10 Bar has been appointed a distributor for Europe, but the housing is from a separate manufacturing company (Nauticam International).
So $600 less than the Sea & Sea D300 housing.
Factor in $1700 for the D300s vs. $800 for the D90, and you're looking at $1500 savings for a D90 vs. a D300.
Although we need to know how port costs compare, I suppose, but otherwise, there you go. Of course, you can use optical connections with this housing, I don't think you can with the Sea & Sea.
(I realize I'm comparing Oranges and Tangerines a bit, since there technically aren't any D300s housings yet, but Backscatter reports that mods should be simple and fairly minor to get things going again, so this will have to do for comparison's sake.)
$2300 is more than the Aquatica. But still, the optical strobe option is nice... I don't think the Aquatica can do that. And it's a little less than the Nexus, and seems likely to be more readily available in the US.
Interesting... if I ever get the money together I'm going to have some tough decisions to make. LOL