Let's not give up, we can make this happen, if you have not gotten a response — keep trying!

7-11 has a Customer Feedback Form on their website.
It took me all of two minutes to answer a few questions and post this:

"Would you please carry the Rocky Mountain High Brand iced tea and energy drinks!
I buy them online from Amazon but would much rather buy them by the single can from my local 7-11 store.
Thanks"

If some more people from here would do this today it might get their attention.

http://survey.medallia.com/?711-gr