@depotfinanzen Normally you can buy them immediately from any reputable jewelry dealer, With me, for example, up to 100 grams without an appointment, they always have something in the safe. And reputable ones will always sell it to you at the current daily rate.
@depotfinanzen Banks sometimes also sell gold, but I would not recommend this as, for example, the savings banks sell gold bars at a much higher price than they are worth because of the design of the cash.
