I think it takes place in mexico or some where around there. In the movie has a brother and sister, she gets stolen away from her family, he goes looking for her. Found out that she's going to be sold online to the highest bider... he gets help from someone(I don't know who) and he find what link to go on to and he starts to bid on her to get her back and they can stop whoever is doing all this..

Trade (2007) (http://www.imdb.com/title/tt0399095/)