The Economist - HBR - Business week single number (Santiago de Chile)

Hi, I have been trying to buy here in SCL a single number of the magazines listed above but it seems that these are not available at kiosks or bookstores... The best recommendation I got until now is to subscribe to receive every single number by postmail, but I only read this publications when a subject calls my attention and I am used to take a glance at them at the convenience store... Anyways, any suggestions??? Cheers