None of those in the link are several thousand pounds. Some of them are a lot of 100 pieces which makes them more.
The free NHS ones are the really visible ones which sit behind your ear and a pipe goes into your ear aren't they? Depending on how much more you are prepared to spend (i.e. up to several thousand pounds) the devices get less and less visible. They also come with more sophisticated technology and remote controls etc. I can see why people might want to spend money to get those.
Having said that if it were me I'd definitely go NHS to start with, to get assessed etc as they may even find a cause which can be addressed without aids.
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