Mil spec Monkey store offers Marine Coyote as an option when purchasing. It doesn't have a picture of the Marine Coyote one. I would tell you to e-mail and check to make sure it isn't an error, but they aren't the best at answering e-mails. They are $30 a pop, which isn't the worst I have seen for single pieces.
http://milspecmonkey.com/store/hardware-diy/550-cobra-buckle-d-ring.htmlTheir FAQ page says they offer wholesaler pricing for orders of $200 or more, and to e-mail them to set it up, but again with the e-mails...
It may be worth giving GSI a call, and asking if they have any or can get any without a MOQ. I've gotten single piece and small batch extra wide slot cobras this way from them.
Chuck