I've managed to grab a spare TLK Voyager Nitro for anyone whose local Big W didn't get that wave, who's happy to do a straight trade for a TLK Voyager Optimus Prime, which seem to be far more common is other places.

Prefer to do a local (Adelaide) swap, but also happy to post if there's no local takers; 500g Prepaid satchels are $8.55 from Australia Post.