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OEM dynamos are hens teeth in the US.
Out of the 30+ dynamo hubs we’ve sold in the last 5 years, two have been Shimano (I just checked how many we sold). For the longest time we couldn’t even get any of the nicers Shimano hubs unless we ordered from shops in Europe.
I know we are an outlier on the global scale, but here at least most commuters use usb rechargeable lights, and the vast majority of dynamo sales end up on touring bikes.
I'd say about 3/4th of dynamo set ups we do have a charger of some sort or another.