You wont be able t find a bra tht size at KMart ot Target or anything that will fit properly.
If you are fitted as a 10E then you are definately not a 12B!
22F isnt an american size, it is just a large cup size....I am a 16FF or 14 G or GG depending on the bra...lol...so it know how much it sucks trying to find one that will fit.

Anyway, head into perth and get fitted properly, there certainly isnt a shop anywhere down here that will be able to fit you correctly and stock the size you are