I didn't say I was sure they don't exist. I said I had never seen one. I don't visit the game stores any more and no longer buy consoles and their games, so I guess I just missed them. No loss. They look extremely impractical and expensive.

Yes and yes.

They're easy enough to use. They cost about £10 to £15

Really? The average price for non-keyboard controllers around here is $60 for name brands and $30 for off-brands. I expect the keyboard to add $30-$50, at least. At the current exchange rates, it would be cheaper for me to get a keyboard-enabled controller.

Or are these attachments? It still seems cheap for a name-brand attachment, though.