Reselling is buying items at a low price and selling them for more — the oldest business model in the world. With eBay, Facebook Marketplace, Poshmark, and Mercari, anyone with a smartphone and some free time can build a meaningful side income. Some full-time resellers earn $5,000–$20,000+/month.
Where to source inventory
Thrift stores (Goodwill, Salvation Army, local thrift shops) are the most popular sourcing spot for beginners. Estate sales and garage sales often have valuable items priced very low. Retail clearance racks (buy at 70–90% off, sell at full price online). Facebook Marketplace and Craigslist free sections. Your own home — most people have $200–$1,000 in unwanted items they could sell immediately.
What sells well
Brand-name clothing (especially Lululemon, Nike, Patagonia, vintage brands). Electronics and video games. Vintage and antique items. Collectibles (sports cards, action figures, vintage toys). Books (textbooks especially). Tools and equipment. Furniture in good condition. The key is learning what sells in your niche by researching completed sales on eBay.
Research before you buy
Never buy something to resell without checking completed (sold) listings on eBay first. Active listings show asking prices — completed listings show what buyers actually paid. This is the most important skill in reselling. An item worth $0.50 at Goodwill might sell for $80 online, or it might be worth $2. Research makes the difference.
Building a sustainable reselling business
Start by selling things you already own to learn the platform mechanics with no financial risk. Then experiment with small purchases from thrift stores. Track your profit per item and time invested. Develop a niche (clothing, electronics, toys) where you can develop deep expertise on what sells and what doesn’t.