Take a look at Slockit or Airlock's page. Can you buy or implement their system? No.

No, but Ethereum works well enough that they are in the process of building their system.

Augur doesn't actually implement smart contracts in a prediction market, not yet at least.

Smart contracts are a building block fo what Augur is doing.

The application of dollar auctions is much simpler. You don't need any 'oracles' for it.