CDNN is a real place, but probably not well known among birders because they mostly sell firearms. If they're blowing out GRs below cost, it's safe to say the GRs are being discontinued.
I stumbled upon the GRs because I found that the Zeiss 8x32 FLs did not quite take the optical crown from my SEs, and I didn't want to have more than $1K tied up in what would be foul weather/backup bins. At the price, I couldn't resist the GRs and came away very impressed--they will serve very well. A more conventional choice would have been something like the Minox or the Kahles 8x32 roofs (which CDNN also has on sale)--I've looked through the Kahles and found them very good. The GRs are to my eye optically better--there is an immediacy to the view through them that is seductive, and so many roofs, even the most expensive, have a kind of haze to them that obscures fine detail. I haven't seen this described in reviews much, but when I'm trying to count tines on a deer in deep forest or make out the difference between a the texture of boar or calf fur at 300 yards, the slightest shortcomings of my optics become glaringly evident. There is no undo function on a rifle, and a major role for hunting binoculars is to help you avoid mistakes. The fact that Leupold is a model citizen among companies and that I feel good about supporting US industry also plays a role.
Ironically, Leupold scopes have always been among the lightest in any given format, so the weight of these things is a puzzle. However, they are still a good bit more compact than an 8x42 glass, they feel good in the hand, and the view is superb for the money, so they're going to stay.