Contact your credit/debit card issuers to notify them if you plan to use your card outside your state. That way you won't run into problems if they think your card was stolen. Also,if you travel outside the US, ask about foreign transaction fees. American Express charges 2.7% of each transaction in foreign currency. You can avoid this fee if the merchant converts and charges you in dollars but the exchange rate may be very unfavorable. Visa cards (both credit and debit) also charge foreign transaction fees. So far the only car issuer that I'm aware of that does not charge fees for foreign transactions is Capital One.