There's a time when a lot of us want to make a few extra bucks on the side and usually one of the ideas that pops in your head is to flip items from buying low and selling high. While browsing Craigslist for items to buy and resell, Sam Oh came across the unlocked mobile phone market. His fascination with automation made this business venture a very streamlined and lucrative one while earning five-figures a month in passive income by selling unlock codes. After generating hundreds of thousands of dollars in that niche, Sam sold his business and transitioned into selling various products that would be fulfilled by marketplaces like eBay and Amazon. While running these businesses, Sam also teaches aspiring entrepreneurs how to follow his footsteps on his Money Journal website.