Regarding carnival tickets (Rio de Janeiro)

Hi Cariocas

Just a little insight i need.. When looking to buy carnival tickets (front boxes) all the option i see is mostly private agents selling at a very inflated price. I spoke to the agency which are going to sell carnival tickets for front boxes in case agents who have promised do not make payments by today. But the trick is you need to buy a frisa of 6 and only sectors 2,4,6 and 8 are available. Though i can adjust with sectors i wanted to know if its possible to get Frisa tickets from anywhere else (individually and not in group) at correct prices and not at such inflated prices.

Any help in this regard will be very helpful
thanks
Vimarshan