From www.aa2000.com.ar

Which are the taxes charged by Customs?

In the case of international and regional flights, you can enter the country:

Without paying any fee:
- Clothes, and personal objects already used.
- Books, newspapers, and brochures for non-commercial purposes.
- Brand-new products for an amount of up to US $300 (US $150 for minors under 16).
- Additional benefit of US $300 (US $150 for minors under 16) for goods purchased at the Duty Free-Shops upon arriving.

Paying the Duty:
- Any goods exceeding US $300 (US $150 for minors under 16), with non-commercial purposes.
For more information, please contact
The National Customs Department (Dirección General de Aduanas):
0810-999-2347

I can't find the Form, but the exemption is 300u$s, FYI most printers/laptops/digital camera chargers are 110-240v compatible, but you need to buy a plug adapter like this (just 3 pesos/1 dollar)



EDIT: here is the form (PDF)

http://www.afip.gov.ar/genericos/for...f/f2087_G1.pdf