buying a visa from the consulate is a waste of money and it has been explained on here many times.
Looking at the wording of the new law, it does state that it is possible to extend the 90 days for another 90 but that means you can only stay for 180 days in the whole year. How this process would be done is still not clear like a lot of things regarding this new ruling. Best bet, get a 3 month residency.