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Sites for crowdsourcing app ideas might work. if people like your idea, they develop it and you get a share of profits. For example:

There are a million ideas. Execution is everything. You need to find a technical partner. Very unlikely someone will pay just for the idea IMHO

You can't sell an idea. Prove you can build it. Then prove that what you built is worth something by getting people to use it.

How to sell an app idea?