You're really going to like that G. Gs and Es are favorites of mine.
I buy my Shick blades from Amazon. That way you can be sure that they are the Chinese Schicks instead of the inferior German ones. I know that sounds counter-intuitive, but the Chinese blades are excellent, and the German blades were mediocre. Personna blades are also very good, but the Chinese Schick injector magazines are much better quality.
I don't believe that the German ones are being made any more, so if you buy new Schick blades, and not NOS, then they are probably Chinese. That price looks attractive for four cards of seven blades. Injector blades cost quite a bit more than DEs, but they last a lot longer. I recently got 25 good shaves from a Chinese Schick, and I have 17 and counting from a Personna 74. By all accounts, it should easily exceed the number from the Schick.