Amazon is a minefield... lots of totally convincing pictures of OEM supplies, only to find the item is a fake death trap.
The daft thing is, there's no reason for a decent one to cost much... they're made in their millions.
Whatever you choose, check the CE mark- if the two letters are next to each other, rather than as if they're made from two circles spaced to touch, then it's nothing to do with European standards.