Last time I did a wire transfer was probably around a year and a half ago - through Banco Piano. All of the banks used to be able to do it, although it wasn't necessarily cheap. I know that Santander Rio, where I have my wage account, can do it, but it was kind of wacky, because they wouldn't allow you to wire out of your dollar acount to the US, you had to reconver the dollars to pesos, and wire from that account.
Of course it is more complicated now, but I highly doubt impossible. I just have been trying to avoid it lately, so I hoard until I fly home, or a family member comes to visit me.