[Greenbuilding] inward-opening wood windows (French Casement?) available in US?

[Reuben Deumling]

A style of window common in Germany (and I think much of Europe) is an
inward opening casement. The hardware is completely different that
what is common in the US--a combination of brilliantly simple hinges
and rather complex hidden mechanisms that permit tilting as well as
horizontal movement. I'm less concerned with being able to tilt them,
though this is very nifty, than with a thermally sound wood window
hinged left and right that I can open inward. Marvin makes something
along these lines, which they call a tilt-turn-hopper, but if you want
a window split down the middle and hinged on both sides like a French
Door, they leave a post in the middle and call it a two-wide window...
This in CVG fir, I'm told, runs something like $2,500 a
piece--probably more when we start talking about simulated divided
lites.
<http://www.marvin.com/default.aspx?page=Tilt_Turn_And_Hopper#Variations>

What I'm looking for is any info on the availability of such windows
in the US or Canada without the center post. Has anyone worked with
suppliers of these? Twenty years ago we imported thirty of these in a
custom size from Germany. That was fun, and fairly affordable, but
they were made of Norway Spruce. I'm open to trying this again, but
would prefer to keep it a bit more local. Thoughts or experience?

Thanks.

Reuben Deumling