I don´t know how good it would fit on celicas or the quality, but these are on special for 30$!!!
I’ve read that the stock gt4 one is discontinued...just a heads up for anyone interested in them!

http://www.erebuni.net/accesscustom/univhs.htm

>>>>NIVERSAL PLASTIC COWL SPOILER

>>>>610CS


PS : If anyone in Canada interested I would consider chipping in for the duties/shipping/customs if I decide to order one.