Parts prices - factory or dealer

[rocket]

The front brake disks on my Cerbie are warped, and need replacing. During the recent service, the dealer quoted approx £105 + fitting + VAT, but didn't have any in stock at the time.

I thought I might order the parts and fit them myself. Does anyone know what would be cheapest...to order them from the dealers and pick them up, or order them direct from the factory and get them delivered to my house?

Also, is it a straight forward part to order, or do they vary according to model, year, etc (mine is a '98 4.2).

Many thanks for any pointers.

Neil