The Google Lunar XPRIZE already has a bunch of teams making decent progress. The $30 million[0] certainly won't fund the whole trip, but it seems to be a big enough supplement that it is encouraging institutions to give it a serious effort.
That being said, I would love to see the competition and effort if the prize was increased by a factor of at least 25.
> Google Lunar XPRIZE $20,000,000 Successfully launch, land, and operate a rover on the lunar surface.
That almost reads like a joke. It's going to take an awful lot more than $20,000,000 to accomplish that. The prize money is nearly irrelevant.
> ALS Treatment Prize $1,000,000 Develop a therapy that extends the life of ALS mice by 25%.
I surprised this one hasn't been taken yet.