Interesting Idea! At the moment is my side hustle only Splinterlands :D
But some years ago I also sold alot of stuff from my home on ebay and it was really cool because then I had more space and also I got a little extra money.
And two years ago when the Fidget Spinner Hype started I also orderet many of them cheap from china and sold it in Switzerland three times more wich was still a really good price for the buyers.