Portuguese Teachers??

Hey guys!!

Happyyy almost superbowl (for all the americanŽs out there)!

I have a question.  I live in Pinheiros, Sao Paulo and am in the market for a new portguese teacher.  My last one wasnŽt the best and very expensive.  So:
>>>Do you either know/have a good teacher youŽd recommend, or have any advice on where to find one?

Also--what is a normal price youŽve paid for a good teacher?  The ones I meet with always say R$90/hour which is crazy, and bargain down to R$70/hour.... (which, to me, still seems expensive for teaching something that every person in this country can do.)  But, maybe less than this means a lower quality class? 

I appreciate all and any advice!  Thanks a lot!
-Cathy