I want to sell my xbox: includes Assassin's Creed Origins, Syndicate, Revelations, AC3, Skyrim, Fallout 3, Fallout 4, Need for Speed Payback, Outlast 2, PUBG, Resident Evil 7, State of Decay 2, Ghost Recon Wildlands, Diablo 3, Gears of War Remastered, Battlefront 2, Dark Souls 3, Dead Rising 3, Destiny, Farcry 4, GTAV, Mad Max, Mafia 3, Mass Effect Andromeda, MGSV, MKX, Naruto Ninja Storm 4, Prey, and Shadow of Mordor. What price should i ask for?