I love the Union Square greenmarket! It's at Union Square Mon, Wed, Fri, Sat. I usually got on Saturday, when the most vendors are there. Awesome produce, meats, etc. I love the grass-fed bison and angus beef, as well as the fresh fish. I try to get most of my fruit, veggies and meat there, then buy whatever else I need from Whole Foods and Trader Joes, which are a few feet away (on 14th St).