That’s right, the two bakeries used by GSUSA are Little Brownie and ABC. Different areas of the country use one or the other. And yes, most are essentially the same cookies with different names, but there are a few varieties exclusive to the each of the two bakeries. For example, Little Brownie, sold here in my area, has S’mores and Toffee-tastic, not available from ABC bakers (the order sheet posted above). And apparently each local council sets the prices.
LOL, me too. When they went up to $1 a box, (sometime in the mid 70’s, IIRC), people were outraged.