Turista Libre's contact info is: firstname.lastname@example.org
I am not connected with turista libre, I only wrote about them. The tours cost between 30 and 50 dlls depending on the event (they used to cost between 10 an 25 dlls). They include transportation and sometimes food and drinks. You should email them and have them put you on their email list.
I apologize for responding so late.
— August 15, 2012 12:17 a.m.