Goodwill or similar organizations have a good business model for this. On the one hand, they take your donations and on the other hand, they sell them for a small fee in their thrift shop. All you need is office space to store and sell. 

 I was all over this haha i was picking at flea markets i was buying on clearance i made affiliate accounts but its was tedious of work. All the shipping issues and money back and ya i was just like nahh im good with this 😌  

 If you have to buy it it’s an even bigger hassle. Plus you’re never sure someone will actually purchase