I'm from Argentina too, and let me tell you, everything is WAY MORE CHEAPER than in other regions. Let me tell you some prices:

• Welcome Bundle: 55.00 ARS (1.32 USD or 1.17 EUR)
• SoU 50-packs: 569 ARS (13.66 USD or 12.11 EUR)
• SoU Mega Bundle: 890 ARS (21.37 USD or 18.95 EUR)
• Heroes: 109 ARS (2.62 USD or 2.32 EUR)
• 2 card packs: 35 ARS (0.84 USD or 0.75 EUR)

Keep in mind that some prices might get a 21% VAT due to some government laws.