I think the 5axis are in the $3-400 range painted but i havent look recently and i have no clue as to how much a oem brz spoiler is. Also if you get a oem spoiler you might have to drill holes in your trunk to mount it or buy the oem subaru trunk/spoiler as one piece. Im bot sure but @
nataku might know
EDIT: nataku says his brz spoiler was $750.