Is it possible, as an american, to buy bitcoin cheaper with another

>zimbabwe dollars
Use of the Zimbabwean dollar as an official currency was effectively abandoned on 12 April 2009. It was demonetised in 2015, with outstanding accounts able to be reimbursed until April 30, 2016. In place of the Zimbabwean dollar, currencies including the South African rand, Botswana pula, pound sterling, Indian rupee, euro, Japanese yen, Australian dollar, Chinese yuan, and the United States dollar are now regularly used.
Source: Wikipedia

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>>3202922

there is constant variation between the price not just between a cryptocurrency and different fiat currencies but also between different crypto pairs.

arbitrage bots take advantage of it and make some cash off the aberrations. unless you're automating it you're too slow to manually take advantage of that kind of arbitrage.