Abebooks.com has a copy available for $12.95 plus shipping. Vol. 21, 1913

http://www.abebooks.com/servlet/SearchResults?bsi=90&tn=Confederate+Veteran&x=36&y=15&prevpage=3

Failing that, I have obtained copies of various years at Powell's Books in Portland, Oregon.

I've done Goggle searches with good results and have also obtained volumes at Amazon.

George Martin