There are iPhones on eBay and Amazon that are I cloud locked, so sometimes people think it is easy to unlock those and purchase them. They think they can unlock at a cost from Apple support but is that true?.
It is not true.
Apple will not remove an iCloud activation lock. Only the person who entered it can do that so do not buy any phone that has an iCloud lock on it. Without the owners help, the phone will be useless.
They are cheaper because they are completely useless.
There are websites on the internet that will tell you if it’s stolen or if someone just forgot the password they claim they’ll unlock it, bit they can unlock only if it’s not stolen. It is not possible to by pass the activation lock.