I just got back from a trip to Brazil. Spent my time training at Gordo Jiu Jitsu. I would recommend anyone going to Rio to train there. All the classes were taught by Gordo and his brother Gordinho.
His students are awesome and train at a very high level. They were all very nice and welcoming too.
We were able to get a private with Gordo and then Draculinho was in town so we also got a private with him.
I am going back in a couple of months to train some more. 
just wondering what is the price to train there and how do they charge.
Lots of half guard?
I'm not sure the price. I am a student of Renzo/Gordinho so I was able to train. I think they have everything from a day/ week and month pass
Even though Gordo is known for 1/2 guard we didn't go over any 1/2 guard techniques. His students were very good though and Gordo did help me out with couple of things in 1/2 guard