They certainly do, if you can afford one. They start at $3,500 for a small one (20 characters wide) and swiftly increase in price from there.

Prices have come down considerably. $1300 or so buys a 20 cell display. Also, in many countries, they are subsidized.

And no, they do not really compare to a 20-character LCD display. Reason is that blind user have to rescan the line with their hands whenever something changes, and that takes longer than visually scanning it. Effectively, blind users only 'see' two or three characters simultaneously.