well, I know you can get it from Bryan at any of his appearances, and probably directly from him as well, but easier & least expensive might be Elderly Instruments,http://www.elderly.com/cgi-bin/elderly/search.pl#930
it's a Homespun Video product, you can order it from them at
Homespun Tapes. 1-800-338-2737.
Elderly retails it for 33.95, other places probably 39.95, Bryan asks $40 I think, but he'll sign it if you like. He also does workshops, did one hereabouts this past February, check his info for his tour dates.
http://bryanbowers.com/
see the Autoharp Page
http://www.autoharp.org/
and check out the Autoharp Quarterly
http://www.fmp.com/aq/