Maybe that's why they are sold out- to make room for the new ones? Just a guess.
I have a .76 (with the Dykes ring) and it runs like a champ. Good slow idle, instant throttle response- great power and its getting better as I run it (GMS take their time breaking in) I have it on my Hanger 9 .60 Super Stick. Excellent combo for general sport flying, IMO.
Keep an eye on ebay for a good deal on one- I paid $70 for mine NIB and shipped.