where is abacus used nowadays?

Yes abacus still in used today, specially for visual impaired students. Eventhough the talking calculator did help for visual impaired students at Braille schools across the nation, but talking calculator do not let students understand the important of number placement value. I enclosed some websites talk about the benefits of using abacus in Braille schools:

http://www.hadley-school.org/resources_list_detail.asp?resource=abacus

http://www.hadley-school.org/resources_list_detail.asp?resource=abacus