The rears on my ZT are £350 a side list price nobody offers an after market alternative
I was lucky, picked up a pair less than £60 on flea bay from a car being broken hardly any wear on them at all but I will have them skimmed if they are out at all which can be done while the discs are on the car.
I am not impressed with the Mintex front disks I have currently on the car I think one is slightly warped so will stick to OEM when they need changing
EBC offer disks as well but they are pretty much OEM prices
Loads of people on Ebay banging out unbranded front and rear disk/pads sets if you want cheap cheap but
http://www.atozcarparts.co.uk/ are often more competitive I got my last set of rear pads from them