okay, so i can't remember the name of the stores. but i did find this link: http://www.britainusa.com/consular/articles_show_nt1.asp?i=33006&L1=33000&L2=33006&a=36133
the one in Torrance i know should be a good one. it is right down the street from another Brit shop that I've been to & should have it (but i don't remember the name, sorry, but if you go there, it's on the corner of Torrance Blvd and Prospect). but that list above has a shop in Fullerton that might be worth checking out since it's closer to you. =)
why in interest in Irn-Bru?