You may try the computer shopping mall called Galeria Jardin on Florida street, between Lavalle and Tucuman.
I am not sure if you will find a genuine Samsung charger. You may have to settle for a generic one. But those are not too bad. Please take your laptop and the old charger to show them to the sellers. Have a close look at the output voltage and amps and make sure they match your old charger.
Sometimes it is only the power cord (which can be separated from the main charger) that needs to be changed. Check it first. Power cords cost only $60-$100 pesos.
