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250000 liters of FLiBe contains 44 tons of beryllium, and the current annual production is 220 tons, so it's possible but not cheap.

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Wow. The ARC reactor is supposed to deliver 270 MWe (when/if it will be built) [1]. So 20% of the world annual production of beryllium for one power plant that would deliver about one quarter of the power of an AP-1000 fission reactor.

[1] https://en.wikipedia.org/wiki/ARC_fusion_reactor

And the original ARC design used 958 tons of FLiBe.

https://arxiv.org/pdf/1409.3540

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