Try tofind an NOS one on ebay. I know Auto Krafters is also in the process of remanufacturing one. Not sure how soon it will be ready.
And if that doesn't work, try the junkyard. I got mine from a junkyard back in '93 for 2-dollars, and it still works great...
Just kidding around, but it was kinda funny. Guys at the parts houses don't even know that a Maverick is a Ford. But seriously, they don't offer them at any of the parts houses and probably never will. As stated above, either eBay or AutoKrafters.