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Sure. I don't have the URL handy, but you can get a Google API key and put a search on your site. You can limit it to image and blog search if you wanted, or do all kinds of cool things. That way is free.
Normally that's a good thing, right? But in this sense, what other people are telling you is if you use the Adsense method, you'll get paid, but if you use the search API you won't. It's not just having this to put on your site that's free, it's also the traffic you send Google's way, that's free too.
But you probably won't make a killing on AdSense for Search anyway. And it takes a few days to get approved for AdSense (at least for content) but you can make the AJAX way work in five minutes.
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