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I have an AutoZone, Advance, O'Reilly' and NAPA, within 6 blocks of me. Amazon has some low prices, and Rock Auto.com does too.
Also, I have 3 junkyards (If they still call them junkyards) reasonably close.
I buy all my parts from Tasca Ford online. No point in using aftermarket unless you absolutely have to because of availability. The good news is Autozone and Oreilly also sell Motorcraft but often not near the best price.