Just to add a little salt to the wound, the 20% on AR credit cards is retroactive to the 1st of the month.
http://www.iprofesional.com/notas/156990-Dlar-turista-el-recargo-de-20-alcanzar-a-todos-los-gastos-de-marzo-cancelados-con-tarjeta-de-crdito
http://www.iprofesional.com/notas/156990-Dlar-turista-el-recargo-de-20-alcanzar-a-todos-los-gastos-de-marzo-cancelados-con-tarjeta-de-crdito