This is what I do in my print on demand bussiess make some design's and then upload it to make account like teespring and Red bubble .It's not Sprint 💜 its a Marathon new RU-vidrs I am right with you keep going!!
I earn money on Amazon (affiliate program) on my bicycle website. Quite often I also buy and sell on exchanges (shares, forex, cryptocurrencies) applying bots that analyze what to buy or sell off. Best to continue reading google concerning the "Logan Lam trader". Dude identifies how he makes money on trade and other things.
amazon and ebay are always options! but i’ve used facebook marketplace and facebook groups for student orgs i’m in too! you can probably do your college bookstore as well