The price you see is the price you pay. The total shown at checkout in American dollars is the exact amount to send, whether you pay by CashApp or Venmo or cryptocurrency.
When paying by e-Transfer, send the precise total displayed on your order so it matches and confirms quickly, and remember to include your order number in the message.
If you have a specific billing or tax question for your records, open a support ticket using the Contact support button with your order number and we will help.