Subscription Purchasing Agent in Argentina

I am looking to hire a freelancer based in Argentina to assist with purchasing online subscriptions and services at the lowest available pricing in the region.
Responsibilities:
Your Responsibilities are only to purchase the subscriptions that we specify for you.
Salary:
It will be based on two ways:
1- Fixed salary (30 USD per month)
2- A commission (1 USD per 1-year subscription account and for the other membership period will be discussed later)
Note:
- We will transfer the money first then you will purchase the membership for us.
- We estimate the subscription requests will be between 20-300 memberships.