Sun tube fitting

I have been meaning to fit a couple of Velux sun tubes but never got round to it. Can anyone give me a rough idea of what they would charge to do this?

One is going to be fitted to the roof and onto the landing, the other is to be fitted to a ground floor extension. Both are pitched tiled roofs and these are the units I have.

http://www.velux.co.uk/Private/Products/Sun_Tunnel

The Velux Rigid Sun Tunnel is installed on a roof to add sunlight to a home. This tunnel is slightly different from the more popular skylight. It is installed above areas that do not get much sunlight such as walk-in closets, hallways, pantries and bathrooms. These places benefit from natural light but do no need an outside view. The sun tunnel is available in 14 and 22-inch diameters and have the ability to brighten even the largest room in the home. The Velux Rigid Sun Tunnel is a flexible easy way to save money and energy.

Hi there I'm Zac inspired roofing I fit solor tubes around southyorkshair the supplier around these parts is tuff roof at dronfield I would recommend spending a little more money on a solor tube the difference is quality I have fitted solor tubes for 7 years I have also fitted velux and cheaper version fakro lite tunnel but as a roofer I would recommend solor tubes . they are made in us and designed for the best lite and bleve me you can tell the difference buy far.