Maybe the largest and most active Atlanta area farmers market outside of I285.
Be sure to wear your walking shoes, you may have to walk some distance too because of the parking situation and events around the square.
If you get there early Cool Beans coffee shop is right on the corner and great way to grab some energy before starting your scavenging.
Marietta Square Farmers Market
Saturday, 9am–noon, year-round
Sunday, noon–3pm, April–November