Here’s a good website for searching all AFL collectables:
http://aussierulescollectables.com.au/
This site also offers a rarity score, it has the Ablett Ardmona at a rarity of 5/10 and the Scanlens at 3/10.
So neither are overly rare, also the price varies depending on condition, but the Ardmona is definitely worth a lot more than the Scanlens.