I hope that I won't need anything, but it's happened before when traveling that I need to replace some part of my laptop (e.g. the power cord) or need a computer-related item.  When that happens, it's not fun to search around in an unfamiliar city for a good shop to buy computer parts.

Can someone with local knowledge, please suggest a place or two that would be a good, reputable place to buy such items in Buenos Aires?   (e.g. http://www.vobis.com/ which is in Berlin, or http://www.jr.com/ in NYC)    I would like to write this information down on paper, just in case.

Thanks,

Aude