As for convenience stores, it's usually not cost effective to go to them directly for just a single product. That's why there are literally dozens of merchandising or distribution companies who stock thousands of lines and sell them into the stores for you.
Now, with that said, you will need to have one of these companies carry your product, but you will also need to PULL the products through the stores by creating a demand from the students.
Getting it on the shelves is generally the easy part, getting it off them is where most of your focus will need to be. Remember: These middle men are a lot cheaper than having to hire your own entire sales and trucking force.
All the Best ...