The deal is not great just O.K. Halo 3 complete could be found for $9.99 used (with card $8.99) + tax at Game stop. The headset apper to be some old looks low quality one and you can ger original Macrisoft one for $5 ($4.50 with card) at Game stop used. So all in all you can save $1-2 with e-bay for disc and headset only, but is it worth it ??? No realy
On the other not I have seen in the past Halo 3 discs only in perfect condition in Blockbuster for $6. I wonder if these discs are some stock of the widely closing Blockbuster stores.