  Mechanical alloying method has been employed to prepare the Ba-Fe-As-P
precursors, necessary for the Ba-(As,P) flux growth of the single crystalline
BaFe$_2$(As$_{1-x}$P$_x$)$_2$. By alloying constituent elementals mechanically,
the Ba-(As,P) precursors are successfully formed at the room temperature within
one hour, significantly reducing preparation time. Using the mechanically
alloyed precursors, we have grown single crystals of
BaFe$_2$(As$_{1-x}$P$_x$)$_2$ with the sizes up to 5~mm $\times$ 5~mm $\times$
0.1~mm.
