Craigslist is a peer to peer marketplace.

Bitcoin is peer to peer money.

So what I'm getting here is, you would like to sell something to Bitcoiners or otherwise buy something from Bitcoiners. I believe the next step is to post an ad asking for a certain number of sats in exchange for a good or service.

I wouldn't say this is the best place to post such an ad, but you can give it a shot.

Is there a system for mailbox post boxes, i.e. places where mail/shopping/orders/deliveries can be deposited by a lightning address and then unlocked by signing with an LNURL wallet to prove ownership? There should be, then Satoshislist can be a great sub here where people will basically barter goods while temporarily going merry go around with almost the same quantity of sats.