The Canon USA store has restocked the EF-EOS R Mount Adapter and it's only $41 (Reg $99)
The Mount Adapter EF-EOS R gives you the ability to utilize any Canon EF or EF-S lens with the EOS R camera, letting you use your existing lenses with the camera and allowing you to expand your horizons. Lightweight, compact and easy to attach, the Mount Adapter EF-EOS R makes it possible to use EF and EF-S lenses without compromising functionality, speed or quality. With a stylish design that matches the EF and EF-S lens look and a sturdy, dust- and water-resistant construction, the Mount Adapter EF-EOS R makes it easy to adapt to more lens choices and possibilities.
Canon Mount Adapter EF-EOS R $41 (Reg $99)
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I was in no hurry, as I don't have an R camera yet. And I do have my control ring adapters.
Basically... they quit the chat-window when I asked the questions. Cancelled because they're out of stock. I don't get it. I mean I GET it, but I don't understand how the webpage says in stock, my receipt says in stock, but order was cancelled because they're out of stock.
Something's slipped thru the cracks