Never drive to a shop expecting it to be in the display case; always call to confirm or reserve it.
If you can’t find it locally, several specialty meat companies ship it frozen: where to buy caul fat
These shops process entire carcasses and are your best bet. They usually have the "organs and oddments" that supermarkets skip. Never drive to a shop expecting it to
If you'd like, I can help you or suggest some classic recipes to use it in. Which would be more helpful? where to buy caul fat
Some butchers may know it by this alternative name.