Autogyros
Two-seat factory-built machines are selling like hot cakes these days.
The economics of factory built single-seaters are different. Lower profit margins and high certification costs have effectively killed that market, in the UK, at least.
Very well-designed Factory-built, Kit-built, and Home-built single-seaters are available in other countries, with excellent safety records, but UK BcarSection-T
certification costs are prohibitive, against the likely UK market for them.
This is a great shame, as the single-seaters are so much more fun to fly.