Ah, thank you so much muncheese!
Yeah, I saw that Perfect Circle's on the Autozone website.
I just got off the phone with a local auto parts store here in Houston, O'Reilly Auto Parts, and he quoted me a Moog Upper Control Arm/Ball Joint for $107.00. And he has one in stock.
He had to look it up under just a regular Explorer, cuz he didn't have anything listed for Explorer Sport Trac. But I think they should be the same.