re.front wheel rotors and brake pads on 2005 Jaguar XK8

why is there so much difference in price from various web sites re. front wheel rotors and disc pads for jaguar xk8 2005,

kind regards,

dermott cox

Asked by for the 2005 Jaguar XK8
there are alot of aftermarket parts out there for many cars. do not buy cheap rotors and pads. some will make noise others may not last very lond. i rec using good oem parts
thank you for your prompt reply,