Rock Auto is great because you can choose from both OEM and aftermarket sources. Within the aftermarket, there can be dozens of suppliers to choose from. I avoid the local car parts retailers like Advanced Auto and C.A.P. because they sell junk.

For used parts, car-part.com is a great place to search your local auto recycling centers. For drivers like me who plan to use their car for 250k + miles, it's a good place to check prices on critical components on a particular model before you buy.

I have been using JC Whitney since I was 13 years old and bought my first car. A 1963 Ford Anglia (for $50 USD), with a cracked rod bearing. Between me, the machine shop, and JC Whitney, it turned into a good first vehicle.

But I just checked out RockAuto, and it's cheaper & has a bigger selection. Thanks. I think.