The currency options are shown below. They are at the bottom of every page on the Thonk website.
The currency rates are updated daily and are usually accurate to within a few cents of the true market rate. Please note that Paypal, Credit Card companies and Wise (Transferwise) use an exchange rate which is more expensive than the true market rate. This service is provided to give you a guide price only and your currency setting has no effect on the final transaction cost. The final transaction is always conducted in British Pounds. The price shown for all currencies (except GBP) do not include PayPal / Credit Card / Wise live currency exchange rate. The GBP price on thonk.co.uk is always accurate.