Deciding how much to pay for a used camera is determined by brand, model, condition, and age. Look up the original retail price of the camera and cross-reference with listings on websites such as eBay, KEH Camera, or MPB. Measure sensor size, shutter count (for DSLR/mirrorless), and cosmetic wear/damage. Accessories such as lenses or batteries can contribute to its value. For example, top models will be more expensive than beginners. Test the camera or buy from reputable sellers to achieve quality and avoid issues. Negotiation, due to market conditions, can attain a fair bargain.