Scholarly debates on sustainable consumption have generally overlooked alternative agro-food networks in the economies outside of Western Europe and North America. Building on practice-based theories, this article focuses on informal raw milk markets in post-socialist Lithuania to examine how such alternative systems emerge and operate in the changing political, social, and economic contexts. It makes two contributions to the scholarship on sustainable consumption. In considering semi-subsistence practices and poverty-driven consumption, this article argues for a richer, more critical, and inclusive theory of sustainability that takes into consideration vernacular forms of exchange and approaches poor consumers as subjects of global history. Second, it revisits practice theories and infrastructures of consumption approaches to consider ruptures, discontinuities, and historical change in infrastructures as a way to account for inequalities and experiences of marginalization.