If you are already producing a great tasting product in a restaurant or Deli and making a living, you probably are wise to concentrate on expanding your retail business. If, however, you are tiring of the daily grind of running a small retail business, but wish to concentrate on producing your product rather than serving it to the public, then you probably have considered wholesaling.
Your wholesaling options are numerous. For marketing through supermarkets I advise you to thoroughly read Packaged Facts book, How To Get Your Product Into Supermarkets.
First, though, you should try marketing through more specialized channels. Health Food Stores, C-stores and nearby deli's and local grocery stores. In such cases you will absolutely need this book and will find it saves you serious bucks and a lot of questions posed to distributors, health officials and your suppliers. I know, because I spent months researching the options and not finding half the information that this book so succinctly provides.
Note: I had so little success finding the information that I chose to team up with a businessman and I became vice president of Billy Bob's Pot Pies in Canby, Oregon. The ill-fated franchise attempt resulted in me returning to work in the Middle East so I could save enough bucks to start producing my meat pies for specialty markets....
The material is up-to-date, with great stuff on Web Page Development, etc. I found his advice on channel management, i.e. where to sell, on finding distributors to be very useful.
All pertinent areas are covered, packaging to promotion to positioning. This is fine overview of the biz from a pro who has been down the paths and knows what it takes, then communicates it in an understandable, digestible and attractive manner.