Or price match the parts with TMS:
https://www.volvoparts.tmsmotorgroup..._content=Parts
and ask the dealer to match the parts price (and give 10% off the labour of course).
Or you could buy the kit from TMS and then pay the dealer to fit it?
TMS seem to give a straightforward 20% off everything. They had a bit of a wobble recently when they migrated to a new phone and email system and everything went into meltdown but my experience has otherwise been very good. Genuine bits sent out very quickly and at a great price.
My dealer said that they simply couldn't match the prices, but were happy for me to supply the bits and they would fit them, which is what I have done for the Disks and pads on both cars recently.