How much do they take for xbox one?

You would have to take it in the store to sell one. They have a price list in their store for all consoles.

Go to the store with your console to assess worth they can't tell you what's its worth based on condition over the phone go to the store with the whole console including your power cables to get your answer

I'd say that calling or if you want to sell one they need to see. If you buy one you might have to go to the store too.

You must call and ask them.