Question about mechanics quote

brandad_1

So recently something went wrong with my z. The alternator wasnt charging the battery and I realized it was the charging system that had gone bad tahnks to the help of some people on here. I dont know jack about car electronics so i took it someone who did and they diagnosed my car and said that my ecu and fuse box (near battery} are bad. He gave me quote of $1100 for the repair and said the the ecu alone from a JUNKER was gonna cost me $600 plus the cost of the fuse box and labor ($370). I was curious so i searched online and i saw a lot of listings <$600 for the ecu and the fuse boxes <$100. Sooo seeing these prices made me build some doubt so im asking you guys. Is his quote reasonable or is he trying to bs me?