You can buy direct
from the manufacturer. The UK company has an American office in New England somewhere.
The blinds that I got from them, and installed myself, are shown in posts 659 and 660 here:
I have the details on whom I spoke to there back home in Toronto. I'm in the middle of a 6 week South American journey, sans the trailer, in Santiago, Chile this week.
Anybody who would like the information can write to me after April 15, when I'll be back and in a position to help.
Oceanair is a very good company. One of my blinds had a defect and they sent out a replacement right away.