On the website www.trainticketsdeal.com we try to offer multiple options for people to book traintickets to specific destinations. We use Price Comparison Pro to include the different affiliate links. Because pricing of those tickets is very dynamic, most of the times the url's provide 'out of stock' which essentially isn't true. That's why we want to change that message with another text, but I wasn't able to find it anywhere (also in your php files).

Long story short, where could I find that message, is it build into your plugin or within Woocommerce (and where to find that?)?