*UPDATE as of May 20, 2020*
Good news. Idaka America, part of an international trading company headquartered in Hebron, KY, became one source for these ratchets!
There's one caveat though...since they're an industrial supplier, they don't have an online storefront. That said, they are the official distributor of TONE tools in the US, and they can even source many other Japanese tool brands like these hard-to-obtain SEK Pro-Auto ratchets.
I got a quote from them and here are the prices for these Pro-Auto ratchets:
MHR-2 --- 1/4 drive : US $20.52
MHR-3 --- 3/8 drive : US $26.68
MHR-4 --- 1/2 drive : US $33.24
*shipping costs from their US shipping center is TBD.
Jeremy, whom I had the pleasure to communicate with, can certainly help you out over the phone or email for inquiries and orders:
Office: 1-865-980-9190 Work Cell: 1-865-300-2512
email:
[email protected]
https://www.idaka.co.jp/en/america/
