Bring some dollars. Maybe 1.000 USD. Check this website when you want to exchange:
Cotización y el precio del dólar hoy. Seguí la información sobre el dólar, el dólar blue, dólar MEP, dólar CCL, dólar ahorro, dólar turista, el dólar Banco Nación, y el dólar mayorista minuto a minuto.
www.ambito.com
Check the compra price. You should be getting the +/-1 peso around that price. Plenty of places to exchange. Just make sure you don't carry too much cash at once.
At the same time, use WU as suggested. It easier perhaps.
My advice is to "diversity", with both cash/blue and WU.