.us Cheapest .US/.Biz with DNS Management services?

[AmD950]

I would like to know where I can register these 2 domains with lowest prices available.

GD is now 5.95/6.20 for .US/.BIZ (Not preferred, very slow DNS update time)
RF is now at 7.99
NC is at 8.88

anyother choices (except NP$ :D)?

Thanks in advance