Actually, it is possible, you can bring in up to USD 12,000 per year legally, and if you do it via bank transfer (SWIFT), you can have them deposited directly to your USD account here (if you have one), and withdraw the USD cash at your convenience. You must declare the amounts to AFIP, and they must fit one of the categories mentioned in COM A 7518.
Basically, the funds arrive via SWIFT at your bank here, they notify you, you go to your bank in person with the AFIP declaration (mentioning the BCRA category), fill out another form (probably ARG 1287) to authorize the deposit to your account, and you're done.