All MODIS products are available free of charge. The MODIS Active Fire Product is available for ordering from the Land Processes Distributed Active Archive Center (LP-DAAC) using the EOS Data Gateway web interface located at:
Additionally, an ftp server is maintained by the University of Maryland, hosting the Climate Modeling Grid (CMG) product:
(login name is fire and password is burnt) in the directory modis/cmg.
Furthermore both near real-time, and the full archive of MODIS active data are available through the NASA LANCE Fire Information for Resource Management System (FIRMS). Data can be viewed in a Web GIS or downloaded as Shape, KML or Text files.