The shop who suggested you come here to ask how much the console would be worth has given you bad advice unfortunately. We are unable to to offer any advice because price discussions in the open forum is strictly prohibited.
If you put the item into an auction on eBay's market place the market will ultimately decide on what the item is worth. You can sell the item here on Amibay as long as you follow the rules. You c an not list something as "open to offers." , you must put a fixed price, you can however, declare a price and then state, "or near offers". You are under no obligation to accept a lower offer.
Take a look at the rules
https://www.amibay.com/help/terms/
If you need any further help any member of staff would be happy to help.