The only good way to get euros in Germany is to stick your debit card (with a 4-digit PIN code) into an ATM (bankomat in German). Your bank charges you a small transfer fee (usually €1-2) and calculates the exchange rate using the bank's middle rate, which is usually better than the rate that you get at the exchange offices or banks. Credit cards can also be used in many ATMs, but may charge high commissions. When changing cash, shop around if you plan to change a large amount - commissions and rates differ. Traveller's Cheques are outdated and practically superfluous in Europe, but many banks and exchange offices still accept them.