DVD is now available from TCM.
Her Sister's Secret DVD. $14.99US
http://shop.tcm.com/her-sisters-secret-dvd/detail.php?p=714741&ecid=PRF-TCM-100188&pa=PRF-TCM-100188
Her Sister's Secret DVD. $14.99US
http://shop.tcm.com/her-sisters-secret-dvd/detail.php?p=714741&ecid=PRF-TCM-100188&pa=PRF-TCM-100188