Re: food co-ops
I think some people consider azure standards a co-op
We just started using them and it's a great way to get things in bulk.
We also shop local co-op grocery stores, for that I would just try googling your city + natural foods co-op.
We're part of a CSA during season (late spring through late fall here) which is completely awesome.
I guess it depends on what you're looking for?
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