Ask HN: How to sell an app making $350k a year?

We've got a very high profile app (iOS + Mac) that we're potentially looking to sell but I'm at a total loss where we could find a potential buyer.

It's generating about $350k a year ($1k a day avg). How would we go about finding a buyer for an app generating this sort of money?

If you're interested in talking, feel free to email me at ios.app.sale.hn@gmail.com and I can provide more information.

The app name is intentionally kept secret as it's quite well-known.