You saw her in the 100 Nendoroids post and now shes available for you to pre-order at the Good Smile Company Online Store. Gumako is going for 3,000 yen where 1,000 yen of each sale will go to the Japanese Red Cross Society.
"Cheerful Japan" is the name of the charity project that Good Smile has created to support the relief efforts up North which was hit by the Kanto Tohoku Earthquake.
Just like figma Mirai, Gumako also started off as an April Fools project back in 2008 but now she will be available as a Nendoroid with the Good Smile "Gusuma Seijin" that figma Mirai already seems to have ^^;
You got until 2011/06/07 to place your pre-order.
Also part of the Cheerful Japan project is the Good Smile Seijin Plushie. Cost is 15,000 yen where 5,000 yen will be donated to the Japan Red Cross.
The best thing is that the plushie comes with some Zettai Ryoiki.
Go place your orders! http://goodsmile.ecq.sc/
