The best way to sell anything is to find a similar product to yours (but less competitive) and find out how / where they sell theres.

The truth is you'll need to make a lot of visits and calls which will mean rejection, but just know that it's a numbers game... meaning, it's all about the # of calls, emails, meetings you take - and over time you'll eventually get sales.

There's no silver bullet, only a lot of lead bullets. You just need to start firing the gun (= pick up the phone and try selling it to stores).

Again, find out who's been successful in this market, and copy what they did if you have no ideas how to proceed.