The Early Bird Gets the Worm, A Person With 2 Hour Headstart Wins
Yup, that holds true for most things in the market here too. Can also think of first come first served. All the freshest and highest quality fruits, vegetables, eggs, meats.... are purchased by 8am or so. 6:30 - 7am is about the sweet spot, all vendors are open and the good stuff is still available.