discs and pads are not that expensive to buy new and easy to fit yourself, a local car parts shop like bullseye or eaven (dare i say it..... halfords)
These are pretty important to the car so i would not buy them 2nd hand.
although for the pads i would avoid alco and trupart.... had trupart before and they cant take much heat compared to EBC
as an afterthought, at work we fit mintex brake box's, they are a kit of standard replacement discs and pads... no fancy sports compounds but they come with a 12 month warranty against disc warping ect..... not badly priced either