Context
With US$ 150 It is typical to make a monthly savings or separate silver for a trip: the difference between contributions is already seen in thousands of pesos. The one who buys the dollars pays the bid rate; The one who sells them to you charges the one who sells them.
For historical reference: a week ago (06/11) US$ 150 cost $ 233.250,00 (+0,96%); a month ago, $ 232.500,00 (+1,29%); over the last 30 days the range was $ 231.750,00 to $ 236.250,00 (daily selling data from argentinadatos.com).
Keep in mind: It is an illegal, unbacked market: the published price is a reference average and each trade may vary, plus there is a risk of counterfeit bills or scams.
The other way around? Passing pesos to blue dollar.