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E.g.:
https://www.bike-components.de/en/KMC/MissingLink-Reusable-Master-Link-p68895/
The 11-speed ones are indeed pricier than I thought.
By the way, you might want to verify if a short/SS cage derailleur will fit an 11-34T cassette, because I don't think it will. By original specification it won't, at least; I think 30T is the max (depending on which series). On top of that, it might not have enough capacity, but I don't know your chainset setup.
Can you point me in the right direction. I didn't think there was any difference in them