Secondary double-glazing panels - cost ?

[pilbeam_mp62]

Could somebody please give me a rough estimate of the cost of secondary double glazing panels that are split horizontally into two separate panes. They are to be fitted in a flat with wooden sash windows. Size of the panel is approximately 180 cm high and 90 cm wide.

As for material, I am thinking white (powder-coated or plastic coated ?) aluminium, but I am open to alternative suggestions. Any advice on cost (and approximate fitting charge) would be much appreciated. There are 9 panels total. Thanks very much.

Regards

[pilbeam_mp62]

Can anyone help with this, please ?

Thanks !