Have to find a set on eBay, etc, or snag a parts bike with pipes. Nobody has new ones in stock any more.
Just checked eBay and there's several stock sets listed, also saw a set of Cobras, and one set of Jardine.
On my phone so I only went four pages deep. I save my search, then go back and check every day, even a few times a day. The listings kinda cycle in/out. You can set an email notification, if it gets listed, they let you know.
I've seen new sets coming out of bike shops when they clean up old stock.