New or used camera lens

[Actaeon]

Another good place for new & used camera equipment is B&H:
https://www.bhphotovideo.com/
eBay is a good source for camera equipment, too, and you can often get some pretty good deals, but I'd be careful buying used lenses on eBay unless they come from a seller with a high feedback rating and the description confirms the lens has been fully inspected/tested. Some eBayers are more thorough than others.