I know that it's possible for foreigners to obtain the RFID transit card SUBE but I don't know where to get it. It seems that it's not sold in all Subte stations.
Where can I get the SUBE card?
You'll want to go to a locutório (like a small shop). It'll be called that - "Locutório" with a purple sign saying "SUBE" in the window.
Where are these shops? There's a handy website that maps all of them in Buenos Ares.
Then according to a blog on the subject:
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