Priced content in Skilljar can be set to one currency per offer (i.e. Course or Path). The default currency type on an offer is in USD. You can easily clone a course and work with Skilljar's Product Support Team (firstname.lastname@example.org) to change the currency from USD to AUD, GBP, EUR, CAD, and MXN currencies.
You can offer courses in many other currencies depending on your integrated payment processor. To allow multiple currencies on one offer, use an integrated payment processor like Merchant eSolutions Hosted Checkout, to offer students an opportunity to select another currency. Customers using Merchant eSolutions Hosted Checkout can also calculate and collect tax on an offer.
Additionally, you are able to set up a priced learning path that will allow a user to purchase all courses within the path at once. The path must also be priced in one type of currency. Read about creating a path here, and read about charging for a learning path here. Please note that catalog pages cannot be priced, so you will need to use a path for this use case.