I had asked about metal blinds, but the thing about those is that while they do reflect a lot of light, they also heat up, so they convert a lot of the energy into infrared light going into the room. So they are not at all as effective as these.

Jonathan informs:
We've been trying to push these blinds for some time as the benefits are fantastic. The problem is that a lot of people don't know they would really want these blinds and if they do have a problem with a room in their house in the summer, they just don't know there's a solution out there.
The premium is around 15%-20% of the cheapest vertical or roller fabrics you can buy. This premium is about the same premium that's charged on blackout materials for both vertical and roller blinds, so it's certainly not exorbitant and should fit within most people's ballpark of what a premium product should cost.
Jonathan, Click4Blinds


