Osmo sells the Little Genius Starter Kit game pieces (Costume Pieces and Sticks & Rings) separately on our website:
https://www.playosmo.com/en/shopping/games/abcs-squiggle-magic
https://www.playosmo.com/en/shopping/games/stories-costume-party
Note that these games are compatible with both iPads and Fire tablets, but only select models.
Here is a complete list of Osmo-compatible devices:
https://support.playosmo.com/hc/en-us/articles/115010156067-What-devices-is-Osmo-compatible-with-