See these links:

This is the FAQ for Colorado but I am sure many of the states are similar.

http://www.nasba.org/licensure/nasbalicensing/colorado/faqs/

Here is the fee schedule for transferring exam grades

http://www.nasba.org/licensure/nasbalicensing/feeschedule/

Here is a copy of the Nebraska & Colorado form that lets someone transfer their scores into Nebraska.  This seems like a standard form template that other states also use.

http://www.nbpa.ne.gov/pdf/exchgex.pdf

http://www.nasba.org/files/2011/03/international_application _colorado.pdf