Believe it or not, self-hosting! I went from renting a VPS for $40 a month, to purchasing an entire $150 machine at home, plus $50 or so in additional storage, plus a $20 a month VPS solely to bypass NAT restrictions... plus a few hundred dollars more when I first started, because I cheaped out on components and managed to brick not one, but two Intel BIOSes trying to update them.