I didn't want to say anything, but I'm close with my dealer and the retail on those parts for my bike was in the neighborhood of $550, which is now in line with your latest report, and of course, there's still the labor. A whole lot more than the $250 if the bike was ordered from the factory with the grips.
Anyway, I'm excited about getting them, scheduled for Nov 24th. Will make that New Years day run a bit more pleasant.
Good luck, and please note any issues, caveats, etc encountered during the installation, so I can alert my guys.