Be aware, I`m a noob, so don`t put to much emphasis on my opinions..
That being said, your domain is short, logical, relevant, and .com, so it should be worth quite a bit.
I`m not going to try to put a price on it, let`s leave that to some users with more experience than me.
But as some other user here mentioned, some of these NGO`s has quite a bit of funding from private donors and governments.
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G8E.com is for sale at SEDO, auction expires in 3 days. IMO not as good as G8C.com but it might give you a low price floor indication?