Yeah, you know it's going to be expensive when you have to call and ask for a quote. It's funny that even the expensive options haven't figured out how to make a quiet electric motor. If you don't mind me asking, how much did yours end up costing per window?
Someone else mentioned the ikea shades coming out in October, so I might wait and see how those are. Potentially much cheaper, but no slatted blind effect, so the only option would be to fully raise/lower them (and deal with whatever noise that generates).