These are the digital successors to the newspaper classifieds. They work best because of their massive user bases.

Do you want to meet a stranger at a gas station, or do you want to print a label and drop a box at the post office?

Specifically for refurbished tech and electronics. The Trade-Off: Convenience vs. Profit

For luxury and designer goods. These apps handle authentication, which is crucial for high-ticket items. 3. The Local "Quick-Flip" Apps