Heh, don't count on others to make your life easier

Three things to consider when purchasing. Quality, price, and service. Ideally, your prime vendor should be able to provide you with the best lettuce at the best price, and have it delivered promptly at 7am everyday. My suggestion is to start building a relationship with a vendor you like. See if you can strike a good balance between the three items mentioned above. The biggest mistake I see in purchasing is going for the lowest price at the expense of quality. Sometimes the product doesn't even match! So for me, it's pretty simple. If I need your produce at 7am each morning but the vendor with the cool yellow seedless melons can't make it there at that time, (not many of us NEED yellow seedless anyways) then I'll purchase from the guy who can get it there at 7am. But do I really want four cases of lousy cow tenders at two dollars less a pound at 7am when I can have the good stuff delivered at 10am the previous day?
Good luck and welcome to cheftalk!
Kuan