Hi i have an original black Microsoft xbox not 360 with 20ish games all the games work and i have 3 controllers complete with leads how much is it worth

Around $580, depending on what games you have, and what the hard-drive capacity is. You'll get around $130 for a well maintained Xbox. Figuring all your games are decent, I say they're worth $20 so that's 400 dollars (if you have 20 like you said). Three clean, undamaged controllers are between $50-$100 altogether. Prices I said will vary depending on who it is sold to. A place like Game Stop or Game Crazy is probably not going to give you a whole lot.