Quite a few stores I've been to in the last month still had a few of the boardies. Make the trek to Sydney and check out a few stores, you might get lucky.
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Compared with our brightly coloured trunks, are these briefs just released in America:
http://www.seibertron.com/transforme...derwear/18340/
(not sure if there is a reason behind the common theme here with evil Megatron associated with a dude's crotch... :p )