All 3 are up on amazon right now for $14.99 but you need prime I think:

Anky & ptero are $14.99https://www.amazon.com/gp/product/B07977KV4W/https://www.amazon.com/gp/product/B07976ZDKB/

Cerato is jacked up but may drop back to $14.99

https://www.amazon.com/gp/product/B0797KPVJH/

EDIT: You may have to scroll down the page to where it says "New (27) from $14.99 "