How much does two Xbox controllers cost?

It depends what country you live in, and if you buy a wireless controller or a wired one. Assuming you live in the United States, one wireless controller should cost about $50. So buying two wireless controllers would add up to $100, more or less, depending on tax or GST if the United States has that. (Sorry, I live in Canada, not the USA.)

But if you bought a wired controller, one would cost about $40. So two of them together would be $80 and drop 20 dollars off your price against Wireless controllers.