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specific tooling investment divided on very small batches of parts = high selling price, that is just fair.
It's either 125$ sprocket (and chain to the meter obviously) or you could engineer a twin reduction setup based on standard sprockets.
Standard front sprockets drive standard rear sprocket that drives standart front sprocket that drives standard rear sprocket.
All in all, you end up with a setup that might be more expensive to start with (but a fair bit less on the long run).
I'd go for the 125$ custom sprocket ...
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