I also contact Grove in the past month interested in the airfoil gear. Below is the response that I got from Flo. Didn't know about the one piece gear. Count me in if someone is trying to put an order together for the airfoil gear.
The lead time for a single gear is 8-10 weeks after receipt of order and payment. We do not have the airfoiled gear available but we can make the standard or one piece RV8 gears. The prices are below:
P/N: 1220-1, standard RV8 gear, $1895
P/N: One piece RV8, $2395