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Genuine Lexus pads are about $45 (www.irontoad.com) per axle. Time for me (amatuer DIY) to change the pads would be about 1-1.5 hours. This doesn't include removing the rotors to have them cut/machined.
I don't know for sure, but I would guess that you'd have to pay at least $200 to have it done at independent garage. Probably you'd not walk out of Lexus service for less than $350, but these are just my guesses.
It all depends what you think is 'fair' based on parts cost and approx. labor hours.