The cables do seem moderately pricey, but obviously not too hard to get... from FCPEuro.com (USA)
slightly confusing but if you have any DIY skills it may be simple enough to do yourself, saving at least $750?
I've not done this job, but I'd guess they're at least semi-serviceable. Probably involves removing some of the center console to access the foot pedal, then the 2 cables to the rear wheels are probably running down the undersides.
So yes, I can see the labour potentially adding up when done by a shop.