Yes, inventables.com has some really cool stuff, but they are sometimes too expensive. For example, the "Super absorbent polymer spheres" [1] are also available

Yes, inventables.com has some really cool stuff, but they are sometimes too expensive. For example, the "Super absorbent polymer spheres" [1] are also available from ThinkGeek for a lot less [2] (And you'll probably get them elsewhere even cheaper) [1] http://www.inventables.com/technologies/super-absorbent-polymer-spheres http://www.inventables.com/technologies/super-absorbent-poly... [2] https://www.thinkgeek.com/geektoys/science/cd32?srp=2 https://www.thinkgeek.com/geektoys/science/cd32?srp=2