Even though the official sites and notices in stations are all trying to convince you that there is no way you can buy a PASMO and Suica right now, scaring all visitors without iPhones away, there are still ways you can buy one now.
Suica/PASMO for Tourists: Welcome Suica / PASMO PASSPORT
This is the officially recommended way, even though they are sold in just a few locations. Also, they expire after 28 days and you cannot refund the unused charged money inside, so I personally do not recommend this. For those working and studying, this is basically useless. You can check out their official sites for where you can still buy them: PASMO PASSPORT, Welcome Suica
Regular Suica: JR East Travel Service Center
As JR did not announce this at all and just secretly updated their visitor-facing website, it got very little media attention. I went to ask the staff a while ago, and I was told that even though they are intended only for tourists, they will not check for documents like passports. This is probably your best bet if you happen to be in one of the stations. Check this link out: JR East Travel Service Center.
Regular Suica: buy a 1-day pass
This approach has the obvious benefit that it can be bought in basically every single JR station. Even though the official website mentioned that only children and monthly pass Suica are still sold, 1-day passes can also be issued on a new Suica. So if your trip has a day where using a one-day JR pass is beneficial (if you live in the west side like Nakano, a round-trip to Kasai Rinkai Park is already worth the cost of the Tokunai Pass!), go to a black ticket machine (that sells monthly pass), and choose the option that issues a new Suica. Check the following video but choose the new Suica option instead!
