I used to do very well selling on eBay buying product at garage sales goodwills thrift stores etc … imo eBay fees have went up to high and shipping costs are insane … also goodwill lists on eBay as well so it’s hard to find good product there for a reasonable price you gotta catch something they missed … so id recommend yard/garage sales over goodwills if your going to do it….between the cost of goods at thrift store rising and shipping and fees so high I ended up giving it up … I was still making money but no where near what it was worth for my time … it’s a good side hustle though there’s a lot of work in research, listing , testing products, finding products, shipping and then dealing with bs scammers … I never did it full time tho if you put the work in im sure you can make out great id recommend getting on some of those thrifting pages on Facebook a lot of people posts their scores so you can get a better idea of what to look for … a lot of people do this full time and make bank so it definitely can be done … my all time best score was I found a nes and a n64 with a bunch of games for each for 75 bucks at a yard sale … I ended up getting around $900 for the consoles and games but that was also a rare nes game called little Samson in that lot that I sold for $2500