I found a great AdSense alternative that pays out at $10. Can use it in conjunction w/adsense too. Try it

The reason I put Chitika on the number 3 of this list, is because Chitika is very similar to Adsense. they allow you to customize your ads, and it only serves contextual ads. One good thing is that you can use it along with Adsense and there are no problems at all. Chitika pays via Paypal ($10 USD minimum, which is good for starters) or via check ($50 minimum). If I were to recommend an ads service as an alternative to Adsense, Chitika would be my first choice, hands down. Chitika can pay you via paypal if you need.

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