I believe that in the current requirements, they simply do need at least one set of standardized scores. It seems that the general policy is to not accept anyone without at least one set of scores. Even very strong portfolios seem to require that.

I would look into ways of getting one of the tests done for cheap. Some people have had good luck through local universities; perhaps getting a student to do the tests. It is not ideal, but it might be an option to consider.