For our alternator, OEM standard amperage is 100 amps. You can find this alternator around the Internet ranging from 120$-350$ depending where you purchase it. Granted, Ebay has them, but I'll stick to a reputable seller instead. It'll be hard to find brand new ones, as many manufacturers do not resell the new ones they produce....instead they rely on the aftermarket to rebuild to ones turned back in for resale.
The part is not hard to install and is located at the top, passenger side of the engine bay. It takes 2 bolts (14mm near block, 12mm under alternator) to be removed before it's off and installation is just the reverse and just as simple. The hardest part is to get the, 12mm bolt out from the bottom b/c you have to do it blindly. Other than that, if you notice a voltage drop or dimming accessories while driving...have your battery/alternator checked. If it comes down to your battery, that's a quick and easy fix anyone can do. If it's the alternator, it's not as quick and easy as a battery, but it's still relatively simple to do.
This is the pic from TRDsparks: