It's free as part of HD, but unless the receiver is hooked up to a 3DTV, the channel is grayed out. If you try to tune it in with a regular HDTV, it just gives you an error saying it can't be watched because the TV is not 3D capable.
Well more specifically 103, 104, and 106 are 3d but 104 is a PPV channel. 106 (ESPN) is 3D but it is only on for one or two games per week. N3D is a cool channel but there's only about 3 programs on it per day (about 6-7 per week... although it is getting better and they are trying.) It sucks that 104 are PPV as there are some movies on it that aren't even on blu-ray 3d yet (Chicken Little, Scar, Bolt (import and Sony Tv only right now) and a few others)