PayPal is the only method of payment we accept. In regards to order cancellation requests, we will do our best to accommodate you however due to the logistics of our business model, we cannot guarantee that such a request will always be granted. In regards to sales tax, we have warehouse processing centers across the country to ensure you receive your package efficiently and as quickly as possible. As a result, we are required to charge sales tax in multiple states across the USA. If your state is one that we charge sales tax in, you will see the sales tax charge at time of checkout before you submit payment.