Internal blinds in windows

[T5GRF]

We are about to order a load of glazing for our extension, this includes 2 sets of bi-fold doors, probably Origin.
I have asked if its possible to have the glazed units made up with internal Venetian blinds. I have been told the cost of this would be £300 plus vat per bi-fold panel, we have 9 panels so this adds a fair chunk to the cost!
Does £300 plus the dreaded seem a fair price?
If we are going for a manually operated system, is there a manufacturer that would be worth seeking out for a robust, well made system?
We did also look at the Origin motorized blind system that is externally mounted in a cassette, this looks very smart but is very expensive!
Any advice or recommendations would be great!

[RC1]

ive used tuiss in the past - reasonable value and lots of choice

[vxsmithers]

that's around the price I paid for mine a couple of years ago (uniblind). The price of curtains would be a similar amount, with the added benefit they don't get dusty and are great for heat control if you are south facing as we are.

[nikaiyo2]

The best ones are Pelini Screenline system.

£300 per unit seems like a really really good price, they are going to be costing him about £250+VAT per door.

[T5GRF]

Thanks for the replies. Sounds like the price is fair then!