Also,

For used parts, I trust LKQonline bc they tag every part with VIN and mileage. You should be able to find a unit with 80K miles on their website for $85. Genuine Volvo.

A good used Volvo alternator is better than a brand-new Chinese unit.

PS: the aftermarket is full of Chinese stuffs...

LKQonline can ship the parts between cities (? for free iirc). You simply go to the local LKQ warehouse (if there is one in your area) and pick it up.

PS: junk yard is an option but look up odometer reading (using VIN) first...