We accept eBay managed payments for all payments. In regard to order cancellation requests, we will do our best to accommodate your request, but we cannot guarantee that these requests will always be granted. Regarding 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.