Keeping upto date exchange rate

Some of the websites that I take the product from are in the US. When you go on to their sites, the price it shows you is in Australian dollars because it changes to whatever country you are accessing the website from, but it’s based off their original US dollar price. Because the USD to AUD exchange rate changes every day, the US sites change the price of the product in Australian dollars and so when it changes, it means that the price on my site isn’t correct anymore. I am wondering if there’s a way for my site to update what the new exchange rate is without having to go through every product every day to change the price….. If we look at that link again tomorrow, you’ll see that the price on Bloomingdales is different again because of the exchange rate changing.
Is there a plugin for that? I saw woocommerce’s currency converter, but i want a free one, or create myself. I mean i open to option