Looking for a source

[dadlamassu]

Last night our grandsons and I played a game of The Hobbit - Escape from Goblin Town.  Callum had Gandalf in his "team" and he cast the "Terrifying Aura" spell.  This lasts a while so we wanted something to mark the figure so we did not forget.  I remembered that in the Conan box there were coloured rings that fit snugly under the bases so a purple one was put under Gandalf.  Later one of my goblin captains was wounded and a red one went under his base and so on.

Now we want to use them in more games so - what are they called and where can I get more? 

Tried the monolith Conan site without any luck,

[Elbows]

Similar discs are used for Zombicide characters as well as BSieged board game characters.  Might be worth looking for bits on eBay from those games?