The developers have a page called Request Information. You will have to fill out the form on that page in order to obtain information about a possible quotation for Petrolog. Make sure you fill the form with accurate data in order to receive a response.
Use the following link to reach the contact form: http://www.petrolog.com/request-info/
I've also searched through the website, and this appears to be the only way to obtain a possible quotation.
