Let's see....

Added amounts for various countries. I have not really worked it out, but it is no different than a standard letter charge. I cannot see it going above $2 so I will just deal with the difference.

As for group buys, I am not sure that would be better or easier in this case. With the Tech Support Spheres, you had something big, bulky and tangible. This is just a single letter (the chips are small, thin and light). If I were to bunch them up, it might be more noticable.