If the stock market is a viable option I'd also suggest roullette... I'm sure I have an affiliate link somewhere :-p
But as far as instant goes... that's about as far as your options take you. Even quick money makers like CPA (Cost Per Action) offers take time as you have to wait for the affiliate payout (as well as get accepted onto the network first!)
But for the time it takes to set up a blog, which isn't long... write some content, which doesn't have to take long... and start the SEO process (which you can get done for you...)
It takes a little time, and there are ways to speed up the process (tools or a team) but you'll always be looking at 2-5 weeks for a return... that's about as instant as it gets.
The best way to start would be to find a good affiliate program with a high payout and a good conversion rate... generally more than 10% if you're starting out... obviously as you mail more people, you can profit well from 1-2%
And if you get support along the way, that's real important too, especially if you don't have an affiliate network you can join.
Take a look at this for an example: http://hubpages.com/business/Sharing-Love-And-Mone...