For a math-based financial planning course--retirement planning with Monte Carlo simulation, assumptions of a Monte Carlo model, reasonability of MC assumptions, Markov Chain Monte Carlo methods, impacts of different distributional assumptions and its impact on projected time to retirement.

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For a more advanced class--GARCH methods for managing volatility with extensions to Black-Scholes, using derivatives to hedge tail risk, combining tail risk discussions with scenarios from earlier discussions on Monte Carlo.

Wise is generally considered the cheapest option to transfer currencies. There are other methods, they are simply generally more expensive. For example, you can wire transfer the money, but this is quite expensive.

The supplier could also ACH your account using a payment processor that supports international cross-currency transfers... although this really isn't avoiding Wise. Most payment processors use Wise to actually perform the currency conversion, you'd simply be having the supplier use another middle-man and end up using Wise in the end anyways.