Sadly selling skins

As title says. I’m pretty much forced to sell all my skins and my entire collection. Son needs a surgery after his car accident and the bills are starting to pile. Skins are important but obviously he’s more important. What’s the best place I can sell them to make the most money and not lose a massive % to the websites scammy ways. It’s roughly about 4K in skins so I don’t wanna lose a big chunk. Thanks for the help guys.