I decided to make a book run today and stopped by Librería Santa Fe on Cabildo and Lacroze. They normally have at least two full shelves of books in English but today, there weren't enough books to filled up even one shelf. Mostly Danielle Steele and Dean Koonz novels. Not exactly my cup of tea.
A guy who works there told me they have more books coming in from the US but that they have been sitting in a container in the port for the past two months, thanks to the lovely import restrictions. He said that after that shipment finally arrives, that'll be it. No more books in English, basically.
So...if you are looking for trashy romance or crime novels in English, grab them there while you can. Although, I think I grabbed the last two halfway-decent books that they had left.