HI, Look around local companies and stay away from the big ones.
A normal door with mid rail and glass/glass or glass/panel should be about �460 including Vat Fitting and ten year guarantee.. We are also selling doors with decorative panels from �490 to �600 depending on the panel design, We have about 20 panels at the cheaper range so you should have a good choice.Make sure the door, including panel, is fully re-inforced, and it has at least a seven point locking system.
Keep away from the big boys. They will charge �900 upwards.
Where do you live?
Rgds Alan