I've tried the search tool, but couldn't find any threads about iHerb?
I use both Amazon Associates, and Adsense, but none of them have come close to the iHerb. I also order from iHerb regularly, and I would suggest it to my friends and family, even if I wouldn't get anything out of it. Anyways...you probably want to hear more about this program:
According to iHerb website here is the estimated income:
"Recent data analysis, conducted in October 2011, found that iHerb customers referring 3 or more people over a year ago earned an average of $240.00. And the figure for customers referring 10 or more people was $640.00. "
How much income you get from sales:
Level 1 - 4% (those who used your code)
Level 2 - 3% (when lvls above share their code, and so on...)
Level 3 - 2%
Level 4 - 1%
More details: rewards.iHerb.com
[affiliate information removed]
You should get 10 referrals pretty easily from your family, and friends. I only got under 100 Facebook friends, and got few of them hooked up easily. Now they shop regularly.