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Do you know how much carbon fiber would be needed to build such a thing?

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No.

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Off the top of my head, I'd estimate maybe the equivalent of 1 million B-2 bombers.

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You're way off. The whole point of the special material is that it is insanely strong. The threads that support the elevator don't need to be that thick. And the platform itself won't be that much extra material.

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Carbon fiber is not "insanely strong", nor is it a "special material". I used the B-2 because its structure is largely carbon fibre-based. How many B-2's worth of carbon fibre do you think is needed for a 10000+km elevator? If the answer is just say 1000 versus 1,000,000 then that is still way too expensive to be feasible any time soon.