Walmart offers the Crayola Marker Maker Kit, model no. 74-7054, for $14. (Amazon charges the same.) Opt for free Site-to-Store pickup to avoid the $4.97 shipping fee. That's the lowest price we could find by $10, outside of the mention below. It includes three 1-oz. ink bottles, two marker boxes, two measuring tubes, mixing guide, tweezers, and 16 marker-parts sets.
Want it shipped? Target has it for $14.19 with free shipping.