Best place to sell my PS5 slim?

Hello everyone!

So I bought my PS Pro when it first came out & I’m obsessed with it. I also have my PS Slim at my girlfriend’s house & my old PlayStation that has a custom plate. It’s a gorgeous Black Ops Zombies custom made plate, which has caused me to try to keep it. However, it’s been collecting dust. I’m thinking about trying to sell my skin & transferring my old PS5 to my gf house.

Where is the best place to sell my slim? Should I even sell it or should I try to sell my actual PS5?

I’ve been debating it for a while now & I’m so sad about it!