I actually sell on multiple sites. Here are the fees for each of the sites where you can set your own price. I didn't lost other second hand stores who sell FOR you (yoogis
fashionphile)
eBay: 13% of selling price (10% eBay plus 3% PayPal)
Poshmark 20% of selling price, but buyer pays for shipping. I found poshmark users tend to try to lowball offers and negotiate, so keep this in mind in terms of your patience
Shop hers: most of the stuff that sells quickly here r high end stuff. Think louis vuittons and louboutins and Chanel. Very few buyers will try to negotiate with you and as a seller, you have to ship your item to the headquarters, who will then take full responsibilities for returns, authentications and other headaches. 18% commission + sellers pay shipping to the hq but well worth it in my opinion
Thread flip. Lots of low balling and negotiation here as well. Very similar to poshmark but none of my high designer items sell here. Mostly out of season manolos and Michael kors things I have sold on here. 20% commission again
Tradesy: 9% of selling price + 3% of that price if you want to transfer yor funds to PayPal. If not, you can use it to buy stuff on tradesy and not be penalized the 3%.
A big variety on what is popular on this site. I personally sell very quickly on here.
Hope this helps!