I was perusing the web looking for helpful Hebrew helps, when I discovered a free Hebrew grammar! It can be downloaded from the site Ancient Hebrew Grammar. The site run by John A .Cook, Assistant Professor of Old Testament, Asbury Seminary and Robert Holmstedt, Associate Professor of Ancient Hebrew and Northwest Semitic Languages, Department of Near and Middle Eastern Civilizations at the University of Toronto, includes two grammars, a Student Grammar, and Biblical Hebrew: An Illustrated Introduction.While the first is available for free as a PDF, the second, to my knowledge is not. One may have to contact the authors about purchasing the latter.
Regarding the Student Grammar,I have looked through it briefly and it seems to be on par with so many that one has to spend between 30-50 dollars for, so these two gentlemen are to be commended for their generosity.
Also, other great resources can be accessed through this site.