Yup, stands for community supported agriculture. They’re often called co-ops or farm shares, but I think CSA is the industry term that you’ll have most luck with when searching around online.

You could try researching CSAs in your area. There are a few near me that sell farm shares with weekly pickup of seasonal veggies during harvest season. I’m in northern California, and our rate is under $20 per week after we split it with another couple. We usually receive more veggies than we would buy during a weekly grocery store trip, plus our farm let’s everyone pick fresh bouquets each pickup as a nice bonus.