I post a request on social media for dead leaves and within minutes I get more than I can use. I swing by whoever lives closest and grab as many bags as I can. Most folks are relieved to get em off their hands. Between my pals bags of leaves and coffee shop grounds, I have enough browns and greens to compost indefinitely. I add in my own kitchen scraps and yard trimmings but the off site stuff is a vast majority of what I'm collecting. Hope that helps.