Metal Halides

I've been having trouble finding metal halide lights where I live and so I
was wondering if someone could give me the name of a mail-order supplier.  I
need about a 250(or higher) watt light over a ~100 gallon tank.  Also, does
anyone know how much this will cost because I really can't afford to spend
that much.  If its too much I guess I'll just stick with 200 watts of
flourescent lights. :-)

                                                        Roni Talukdar