CSA's are one way to access local food, but not the only way.  Here are several other places to search for what is available in Northern Michigan.

OnlineFarmMarket.Com 

Buy direct from northwest Michigan Farms.  A local website connecting Northwest Michigan Growers with you!  The Online Farm Market is not a middle-person, but an easy way for food buyers to see what local farms have available.

Cherry Capitol Foods

A Traverse City company that "brings the best of Michigan foods to you." 

Taste the Local Difference

A Food Exchange hosted by the Michigan Land Use Institute