I used to flip musical instruments on eBay occasionally. I stopped for years, then restarted almost 2 years ago after I stopped by a garage sale and found a few dollars worth of stuff that sold for about $50.
After that, I was pretty pumped to get out there and find more stuff to flip. Then, school started back up (I’m a band director), and I lost most of my evenings and weekends to my day job.
Shoes are everywhere, so I realized that I could pick up shoes from thrift stores and keep making money on the side while work was busy. It’s a weird twist for a musician to sell shoes, but I love it!