Re: Shop around.
As a user of some of these funky hearing aids it is not as straightforward as just the price.
As another comment eludes to, you need to have them programmed to match your hearing loss. There are apps with some of them where you can mess about but they are not the same as putting in the correct map. They will also upgrade the firmware and replace the receivers.
Taking the £3000 at Boots, the equivalent at Specsaves looks to be around £400 cheaper, I don't know of how the ongoing support is managed. As for £600, I cannot see any at this price other than second hand.
These Samsung gizmos are an interesting concept but the one fatal flaw is that the are in-ear with a blob completely filling the ear. Many hearing aids are open design allowing natural and amplified sound to mix. For profound hearing loss there will be a closed design or more funky bits on the ends.
The behind-the-ear type are pretty robust and stable in the attachment to the wearer. With the small RIC transducer you don't really notice them. These are completely different with a sealed fit so they work as a headphone. I can also use mine with some funky microphone technologies that make a huge difference to how one can hear in difficult or specialist situations.
I have no doubt that some sort of earbud can be made to work as a hearing aid BUT, and this is really crucial, if it needs another device to operate (ie phone) then it rather limits it's use.