Context
What a US$ 40 purchase costs in pesos: an online purchase or a dinner on a trip. The card dollar has no bid price: it is only what you are charged for each dollar spent.
As a historical reference: a week ago (06/11) US$ 40 cost $ 81.640,00 (0,00%); a month ago, $ 79.820,00 (+2,28%); in the latter 30 days the range was of $ 79.560,00 a $ 81.640,00 (daily sales data from ArgentinaDatos.com).
Keep in mind: It is the official selling rate plus the 30% advance tax collection (RG 5617), which you can credit against Income Tax or Personal Assets tax or request back. For foreign digital services, 21% VAT and Gross Income tax depending on your province are added.
The other way around? Passing pesos to card dollar.