Word from Banter Toys, who are the distributor of Topps Trading Cards and Loyal Subjects in Australia...
That should be Series 2 of Loyal Subjects, not Series 3, as the second series is on their site as coming out in July. (and there has been no mention of a third series yet)The new Series 3 Loyal Subjects figures will arrive middle of next month, with the Limited Edition Nemesis figure already in stock. These figures can be purchased at EB Games, Kinokuniya (www.kinokuniya.com , Scifi Toys (www.scifitoys.com.au), Impact Comics (www.impactcomics.com.au), and Karrinyup News (Shop G3 Karrinyup Shopping Centre, Karrinyup WA 6018).
I'd be guessing that those stores and sites would be where you can order the Nemesis Prime figure, or maybe have a limited number in stock. Best to ask them about it.