Cost to replace 2 catalytic converters?

Hey! I drive a 2002 Nissan Pathfinder. It has roughly 125,000 miles on it and the service engine soon light came on recently. I took it to a mechanic and they said that the right catalytic converter was shot and something about 03 sensors. Anyway, they said that the total to replace BOTH catalytic converters would be $1700 total (labor, parts, etc.) Is that accurate? Am I getting ripped off? I just wanted to make sure that this was an OK cost to replace 2 catalytic converters. Any advice/info you have would be greatly appreciated. Thanks