In terms of technology and metrics you'd be looking at probably these guys: http://www.mybasis.com/ These guys received indiegogo funding but havent' launched yet: atlaswearables.com
Hi there, I'm afraid that the only possible way is through promo codes. If I am not mistaken the person who wants to buy your app in Bulk wants to give it out to patients individually correct? Not that it is a hospital or such where they could simply use the same apple ID to login and put it on ...