I'm afraid no matter how many come and quote, you won't find anyone to do it cheap - we went through several.
Getting a blind to drop/retract at an angle and look good when up and down is actually quite complicated and those that can do it know there is no cheapo competition so have absolutely no incentive to reduce the prices. Every install is a custom one because sizes, roof angle etc are always slightly different.
The tinting windows seem like they'd work but wasn't that common (7 years ago) and at the time all had their own issues - in any case, it seemed to double the cost of the glazing when done in the odd shapes, so came in at similar prices.
Getting a blind to drop/retract at an angle and look good when up and down is actually quite complicated and those that can do it know there is no cheapo competition so have absolutely no incentive to reduce the prices. Every install is a custom one because sizes, roof angle etc are always slightly different.
The tinting windows seem like they'd work but wasn't that common (7 years ago) and at the time all had their own issues - in any case, it seemed to double the cost of the glazing when done in the odd shapes, so came in at similar prices.