In fact, Saudi money does support these demonstrations. It passes through cover organizations first, but the Suadi claims, which you appear to repeat, that they do not fund US demonstrations, are complete BS.
Let me be clearer there is no money from the Saudi government (which is the implication) funding these groups anymore than there is money from the US government. And I doubt that there is any money from Saudi citizens either.
The money comes from anti-American Americans. And you have NO proof to the contrary.