You cannot sleep in on Saturday and expect the black raspberries to sit around waiting for you to show up at the farmer's market. You just can't. They will have up and left you forlorn and bereft, as they jump quickly, even frantically, into the first reusable cloth bag or colorful wicker basket that strolls by.
The natural habitat of berries at a farmer's market is close to the pay station. It's no good standing around waiting politely for the line to shuffle along the table to the berries. Say "excuse me" if you must, but slip in between and grab some of those jumpy berries NOW, and return to the end of the line, holding on tightly. You will be ever so glad you did once you reach the pay station and survey the scorched landscape that was once a lush berry patch. Remain vigilant until you have paid for the berries and secured them in your reusable cloth bag/colorful wicker basket. Because when you set them down on the table to retrieve your wallet, so as to make an offering to the berry gods, 99% of the time the hand of the person behind you will instantly hover over your berries while they ask, in foolish hope and lust combined: "Are these yours?" Whatever you are in engaged in at the moment, stop and lay a hand possessively somewhere on the berries with a firm "Yes!" that brooks no sharing.
Secure the berries carefully in your vehicle, in a cooler if you can't park in the shade. Then, and only then, return to the market to shop for the more abundant comestibles, the zucchinis and cucumbers, the cabbages and carrots, the peppers and potatoes. These will make the bulk of your meals in the coming week but the berries will make your bliss.
In your childhood you watched cartoons on Saturday morning and then tramped the woods with your friends, collecting the berries in a bucket, eating as you went, returning home with stained hands and a pailful that your mother turned into something delicious. You only had to compete with the birds, and there was enough for everyone anyway. But you washed your hands, and grew up, and went away to college, and then to grad school, and then all over the place, and now you live a cosmopolitan life in a city that offers so much more than you ever could have dreamed of in your little home town. You can have anything you want, really. You can even have your berries and eat them, too.