Since NE Sash is the only company who can sell you Schuco's in the Boston area, they can call your bluff because there is nowhere else to go if you really want Schuco's.
Search here and on the other site for NE Sash or New England Sash, you may decide to re-evaluate whether you want to do business with them. I didn't.
Plus, for $1200 a window, you could get RbA!
Seriously, there are lots of good windows, you don't need to spend that kind of money.