Until very recently (like 6 decades ago) the area where I live was right up against rural countryside, with sheep grazing, cattle farms, vegetables grown and everything. And those farmers sold out to real-estate developers.
But there are literally homeowners in SFHs with chickens out front and roosters crowing in the morning. And some of my colleagues own chickens and harvest the eggs every day for their own kitchens and families.
But just going through a few urban neighborhoods on Google Maps, it was not long before I found little farms. And these farms sometimes have websites where they advertise that they are selling produce and dairy: raw milk, fresh eggs, fresh fruits & veg, mutton and even live sheep or goats. And they may be doing it on the sly or under the table, and "raw milk" is especially a controversial marketplace right now, but they do it and seem to do alright.
These "urban farms" are often real close to tactical supply shops running out of some guy's garage, and other little "cottage industries" where people who purchased "McMansions" are recouping their investments, basically by skirting the city's zoning laws and tax regulations around businesses.
So yeah, if you've got a brown thumb like me, you can go shop at a farmers market, or you can look up one of these "urban farms" and buy direct, cash in hand.