Where are you buying your computer components and other tech?

Wondering where people are buying their PC/Computer components based on price and available selection. Here in Argentina? Trips to Chile? Miami? Somewhere else?

I have same question where "are people are buying their PC/Computers & components"" 
my laptop PC is on it's last legs here in BA and I have no travel plans.
I know that imported stuff may cost 2 or 3 times what it does in Europe or the USA so if anybody is going on a round trip to either place I'd gladly give a premium to anyone who brought  a pc back for  me,

Alternatively where is the best place to buy a new PC in Buenos Aires?