I have 2 xb360 halo 3 controllers (one Spartan, one Covenant). Both are opened and have been used, but are in excellent condition. I was at a conference a couple years ago, and got Todd McFarlane to autograph both controllers with a silver marker. The controllers have not been used since, just been stored for safe keeping. I am pretty sure I still have pictures of McFarlane signing the controlelrs too.

Does anyone know about what these would be worth if I were to sell them later? I am not very good at determing intrinsic or collectable value.

Alternately, can anyone suggest where I might be able to find out approximate worth of the controllers?

I appreciate any advice, suggestions or assistance.

Thank you,