Hi ashley,
Mate try GCCR on the gold coast, they may have a couple of seed blanks left available, although they are not bringing any more in to my knowledge. Last time i spoke woth them they were going out of them. As for Hots, try contacting E.J.Todds, they stock built up hots rods, not sure on blanks alone but they may be able to shed some more light on it for you.
Dave.