Greatest exposure is eBay, but also will cost you. PayPal and Ebay fees = 13%, so divide your goal price by .13 to get the Ebay listing price. Also FYI they take that percentage fee out of your shipping cost as well so make adjustments as needed.
Facebook has both a local and national listing section (never tried I dont have social media).
I just got robbed on craigslist, b!+ch gave me counterfeit bills, plus it's a hassle because you have to make time to meet in a public place, you definitely don't want them coming to your house because if they're bad peeps they may wanna see what other goodies you have in your house when you're not home.
Safest would probably be list them here and sell to well-known members, but you're going to need to have the prices be pretty competitive.
I blame Lee for that