I know there are a few dealers on here that may help.

at my next service i am going to need front and rear brake discs could one of you give me a price please

1.9 tdi 105 estate YK55LJZ

Or some links to suppliers

Have you tried Euro Car Parts, or GSF Car Parts? Pretty reasonable prices on there.

Cheapest I've found is

Genuine front discs are about £47 each

Genuine rear discs are about £40 each

Pads are about £50 for a front set and rear are about £42 a set.

That's not delivered.

http://www.eurocarparts.com/ecp/c/Skoda_Octavia_1.9_2005/p/Car-Parts/Brakes/Brake-Friction/Brake-Discs

There seems to be a choice here are the sizes slightly diferent, thanks for the link BTW