Thats funny....
Seriously though, ring a few places so you get an average price. Also ring a parts supplier and price the discs and pads so you can guage what the garage is charging you for parts. May be cheaper to supply your own parts and just pay a garage to fit them. Garages will always add a bit to parts to make money (some get abit carried away), But atleast if they supply the parts and you have any issues, they cant palm you off and say "you supplied the parts so not our problem......."
Happy hunting