It would be a good oppertunity for someone to sell you an old model and upgrade theirs to get a newer picture. Old cams do wear out the mechanism that moves an IR filter back and forth when night vision changes, so weigh that up in price savings. Suggest posting what country your in. Someone may also want to upgrade because newer cameras have built in object detection and their does not and is still new.
See this post for differences between cameras in a vendor neutral way. I keep it updated as it’s generic advice and a lot of forum post link to this one post.