Everything done in person and paid w/ cash.

FB definitely has it's issues, but around here it's the only way to sell stuff. More BS offers and people that will ghost you than I ever had when dealing on craigslist.
Nobody uses craigslist around here anymore. Used to be page after page of parts for sale there. Now there might be one or two things added per week.
Stuff I know I'll need to ship, I usually sell through the classifieds here on Moparts.
Swap meets are few and far between in my area. I'd much rather do that, but there aren't many mopar guys locally so it wouldn't be worth it.