Unless you have a connection at Ford, www.partscheap.com
is probably the cheapest place to get one. Comes as a kit with the cover, 2 white posts, 1 black post, and 1 nut.
2012 Focus Titanium Hatch-6/12/12 Build Date-Tux Black-Charcoal Cloth-DCT-Winter Pkg-Moonroof-K&N Drop-in-Magnaflow 15072
2014 Focus ST2-9/9/13 Build Date-Perf Blue-Charcoal/Blue Recaros-Moonroof-Cobb Intake-Magnaflow 15155-QuickLifts