It depends on you're state i use and app HERE which is local of course and its called "OFFERS UP" meet up with people buy or trade!

I don't know of anyother sites where you can barter

I tried Mercari I had a good experience and a terrible one. It's the sellers who make the site. If the seller is stand up its good because they bargain and the shipping charges are negotiable. Poshmark charges a fixed shipping of 5.95 which is more than what it may cost depending on the item. I have not delt with Mercari customer service but I might be with a pending transaction I am still waiting for my item.

Mercari is such a scam. You do not get money unless they rate you and many people are dishonest fake sellers.

Mercari is a good site they are reasonable on prices and there are people on the site that do trade with other's for new or gently used merchandise. But they usually go by your ratings on the stuff you have sold on the site. But beware because no matter what site your on there is always a possibility of a scammer. Always ask questions about the merchandise before you make the exchange. Always mail at the same time and make sure you take insurance out on the item your trading with incase the person really is a scammer at least you won't lose out totally on the loss of your merchandise. Also make sure they give you the tracking number if they really did ship your product then you will be able to see where it is at all times until it gets to your home. I hope this helps. Good luck

There are a lot of towns that have trading... Look at sonoma hitch and barter

Have you tried Mecari?