Hi wile_e,
I understand your feeling. I'll be concerned to be deduced more than I promised to pay by "signing" in the on-line shop.
I'm sure that if your credit card will be issued for USD account you will be deduced exactly for the signed amount, but if your account is based on the other currency, bank and credit card company will ask for fee to provide currency exchange.
No one excessive penny will be received by ALWIL Software, Outpost, ShareIt or element5!
Be so kind and drop me PM containing your e-mail or ShareIt order ID and I'll send you the confirmation message containing all details about your payment!
best regards Eduard