Wired Xbox 360 Controller + Wired Headsets

Hey guys, sorry if this is the wrong section, but I have an extra wired Xbox 360 controller and a couple wired Xbox 360 headsets and I was wondering where I would be able to get the most value for them?

How much would I be able to get if I trade them in to GameStop and does anyone know if they ever have promotions that get you extra trade in credit if you trade in multiple accessories (kinda like the trade 3 get an extra $10 deals they always run on games). Thanks in advance for your help!

If they are in good condition, with the sticks not broken and the buttons not busted, you can get a good deal selling it even on this site.