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It is fairly rare. It can be had, but Winchester only makes a limited run once a year and it isn't guarenteed that they will make it. I had 700 pieces of NIB brass that I sold with the rifle.
You can easily neck down .25-20 cartridges to make .218 Bee cases. You could even use .32-20 cases but you'd have to anneal the case necks first (and it would be best to run them through a .25-20 sizing die first).
Where are you located I've got a bag of Win. brass that I got by mistake. It was in with the 22 hornet brass. If your somewhere close so the shipping wouldn't be to much it could be arranged. I'm in the Okanogan.