feels obvious to even suggest this but have walked up to a nearby farmer's market by my work and bought veggies on a whim. my real amazement isn't about the amount or quality you can get for a price that (for me, at least) doesn't seem that much different from grocery store prices. it's about how fresh it stays!!
my kale! jalapeños! red cabbage! these onions! usually produce from grocery stores are done within a week, some certainly less. the fresher it stays, the more you can get your money's worth. feels a bit silly to realize this, but wow it's true!!!