I can do lookups from the following book:
ABSTRACTS OF ROCKBRIDGE CO., VA
CIRCUIT COURT WILL BOOK 1 1809-1874
by Rhonda R. McLure, pub. 1990
Although I don't know if this is a COMPLETE abstraction of ALL circuit court records for that time period in Rockbridge, (as it does skip pages exracted, i.e. 24 to 28, etc.) it does contain 1,235 names, inc. some slaves.
It contains abstracts of wills, bonds, sale bills, inventories, guardianships, and settlements.