I'm curious, both Border and Zephyr... Do you actually spend some time searching for great deals on popular items you can churn or are these random lucky one time occurrences?
I don't put much effort into it now, but I remain open to the possibility. With this one in particular, it's a product of my former habit of constantly wishlisting and drooling over all this fancy shit for possible personal consumption. After I started cutting costs, but while I still had some price alerts going, I just happened to see a hell of a deal, and realized that while I didn't want the thing anymore, it was undervalued enough for a profitable resale. So, I guess really just random luck. I don't think I would even know if another one popped up now.
I've done this with a mere handful of things in my life, some of which I researched on the spot after finding them in a thrift store, etc. Some people do it as a hobby, some actually professionalize it, but it's hard to derive a high hourly pay from what I've seen. If I factored in research time, this would probably beat my day job for hourly pay, but the more you try to replicate it, the more it's diminishing returns. I'm mostly just guessing here, but obviously it's an outlier - I watched for a year to get an obviously underpriced one, and waited another year to sell at near-market price. Very illiquid just because they sell in such low volume. Other stuff might be easier to buy and sell but with much smaller margins.
