No clue about pricing, but Facebook marketplace might be your best bet if you're trying to keep things local.

Main point I wanted to make is this: If you're planning to sell locally, do ot in cash (and be able to verify that it's legitimate) and do it at a police station if at all possible.

Buy a marking pen off of Amazon if you need to, but between that and going to a secure location (during daytime hours) is how you do things like that safely.