I created an app for a popular shopping cart. It is now listed in their app store and it gaining some traction, but not as much as I'd like. The idea for the app came from users asking for it so I know that it is much needed. I think the challenge is that people just don't know about it; I need to educate them. So, I've realized that I can buy a list of online stores who use this shopping cart. Then I can find their contact information.
My question is, how do you recommend that I get in touch with them? For example, I can send out a mass email, but of course that is spam and everyone hates that. Any ideas?