east goal line. Of course those tickets aren't as good of view as the sideline grandstands, and thus that is why they are still available.
It looks like those GA tickets by the east goal line are $10 per ticket or $5 per ticket for a group. I am not sure what size of group is required to get the $5 discount.
Those are the stands on the opposite side of the field from where the ROC sits. I did notice in the Az St. game that the ROC side (west side) stands were full (as well as the sideline grandstands) but these east side general admission stands were less than half full. In football you would call them end zone seats. Not sure what the correct terminology is for soccer.
And the BYU map is actually flipped from how the stands appear on a real map. These GA seats are shown to the left on the byu tickets map, but in real life are actually on the east side not on the west side.