Looked and didn't see this posted. Newegg has Turtle Beach DX11, refurbished, for 49.99 with code EMCNBHF52 and shipping is free. Code is valid til 8/30.
I have a set of these that I picked up at a yard sale that were virtually new for $1. Very comfy and great sound for the PC Gaming I do. Never have tried hooking them to Xbox.