hhaaha, master of FF7 here to save the day!
if you missed the w-item materia in Midgar, you can find it in Bone village. i've done it.
to get it in bone village, DONT get it in Midgar, start digging, say you want , i think, GOOD treasure, not normal, (sorry, can't remember which one), do NOT set up any workers, just say you're done, set off the bomb, and dig near the ladder where it looks like someone scuffed an X there. go to the middle of the X and dig. you should find it. ^_^ but you'll only find it in disc 3, if you miss the materia in midgar.
by the way, (getting off teh subject), where do you get the W-Magic Materia? i looked everywhere and can't find it! 0_o
