Name: Marilyn Kentucky (Zone 6a) Laughter is the Best Medicine!
Beautiful pale yellow flowers. From looking at the database entry, I'm surprised that a greggii is listed as hardy to zone 9a. Looks only to be available in Europe at this time when I did a google search.
Name: Kermit Carter Elk, California (Zone 9a) Offering 400+ Salvias and counting
There are similar or better clones here in the states. No true yellow Salvia greggii though. Any yellow flowered form of the Mountain Sage / Autumn Sage group are likely complex hybrids. This article discusses yellow in these plants: