Actually auto art is coming out with a wrx and sti also. goto
www.autoartmodels.com under 1/18 scale and ten choose performance division this will show you all they have available. owing 60+ die cast cars my self I have found a few places you may want to try
exoticar.com ashevillediecast.com
and I beleive that auto art has a link to dealers, if not try maisto.com and they have links to pleanty of onlin dealers for diecast models.
a guy here in the chicago area has a diecast store and has 3 22b's in stock
if you want the # let me know he may be able to mail it to you.