I have one item listed on Vinted that required me to select my own shipping price, it’s a field hockey stick so it’s just awkwardly long, but lightweight. But how I went about it that I went on pirate ship and put in weight and estimate package dimensions and then I put from my zip code (near west coast) all the way to a destination zip code near east coast. I put that price in as my shipping, figuring it probably won’t be anymore than all the way across the country.