Buying used DJ equipment on eBay isn’t so bad, if you do it right. Use the sites own tools to make your decision.
These days, it’s easy to see a sellers reputation before you buy. You can browse his store, see what others say and read through negative feedback (if any). Most reputable DJ shops you find online are actually brick and mortar stores that supplement their sales with online stores. And if you find someone that doesn’t have much of a reputation, there’s always PayPal and eBay to make sure you aren’t scammed. Just look to see if your purchase is covered or not. Also you can check prices of used DJ equipment compared to new ones in real time while online. Good Luck and happy hunting!