Recently utilized the sales tax registration services of Vatcompliance. Very convenient and fast! The site provides detailed information about sales taxes in different countries and states. They help you prepare the necessary documents, keep track of deadlines and provide reports. As for the cost, it depends on the specific requirements of your business, but they provide transparent rates on their website. They promise to conduct the registration as quickly as possible, and the timeline depends on the specific requirements of your region. I have received my results within a few weeks. You can contact their support team for more specific information.