Manfrotto DADO kit is easily found at assorted photo stores. I just ordered a kit myself. I like the red ball thanks for the heads-up, Akira.
You are welcome, Birna!
Sorry I should have mentioned that DADO is offered in two different kits: in addition to the red ball, the smaller kit has three double-sided studs and three rods, and the larger kit, six studs and six rods. I bought the larger kit on the premise of assembling a mini-quadrapod (its usage is depicted in the thread Snoogly found) and extending some of the rods.