Hi Ines,
I will willingly proof read your thesis for no cost whatsoever. I am a British national residing in Central Portugal. I'm afraid I don't have a degree but I have proof read my son's Politics theses both for BA and MA and his results would suggest I made a reasonable job of it.
If you are interested let me know. I believe that students deserve all the help they can get so that is why I wouldn't charge you anything.

Billybranco