Walk up and talk to the owner....lol. What do you think you can provide that he already isn't doing? Prior to any sales pitch make sure you have identified the following:
(1) Opportunity: Is something that you see.
(2) Need: Is something your potential partner, customer, etc. is willing to acknowledge that they need. For example, let's say you tell him you can increase his production rate by X, and perhaps save him Y, which is less than he's producing his products for now. Also, perhaps you could team up with him to purchase various inventory, thereby reducing cost across the board.
Once you have identified two (2) needs you have a 68% chance of closing the deal, so basically don't talk yourself out of the deal at that point.