Part up charge

Hey all, owner of a 2017 Mazda 3 Touring. Need to get the front control arms replaced because the ball joint is shot. Normally I’d do it myself but don’t feel quite comfortable accessing the undercarriage for some of the control arm bolts. Mechanic quoted $900 in parts for the front driver and passenger control arms only. Said he was using Moog parts, which I see on Moog’s website for ~$160 a side. Said the parts are more expensive because they have to source through approved suppliers for their warranty/insurance. Is this normal?