I gotchu, fam.
https://www.ebay.com/itm/293197551753
There are lower priced fobs out there, but there is some ambiguity about whether they work on the ST. This one specifically was used by someone else on the forum. You still have to pay ~$60 to get it programmed and the emergency key cut, but the fob itself costs twice as much from the dealership.
As for what I did for my ST today, I took him out for a nice morning drive in the country and ordered (yet) another plastic skirt piece for the front seat. Something about either the way they're designed or the way I get in and out of the car makes them stupid easy to break.