Road Atlanta - Huge elevation, fast track though.
AMP - Elevation, very tight track.
SCCA does a Tail of the Dragon hill climb, I think twice a year now.
Other hill climbs as well.

Check out www.sedivracing.org to find a schedule of events and hill climbs.

As mentioned, Little Tally is another good place, no elevation though, but usually very cheap and it has some tighter bits.

Roebling Road in Savannah is similar as well.