If you are in Germany, I suggest you go to Lidl, they sell loaves of white square bread slices, fit for making the plain old fashioned toast you are talking about. Also large in size, too!! It should be easily spotted, it is called something like "american sandwich" or something like that, with strident blue and red design on the plastic wrapping bag. You will like Lidl, I am sure you will find oodle of goodies at very good prices!!