If you think Aussies typically don't do PCTs, then you've been asking retards.
Tamoxifen citrate is a S4 medication and not prohibited for import. You can order a 3 months supply from online, offshore pharmacies (do a google search for once that doesn't require a prescription, there are thousands of htem) and customs will not touch it.
Clomiphene may however get stopped by customs. So your choice is easy.
Ebay or oztion (google oztion aka quicksales) and type in PCT, then private message the supplier to see if they have any.
You aught to have worked this sort of shit out before you took the plunge.