I searched an SEO friendly domain name, which is available. I did not buy it. The next day, I searched it again. It's bought by unknown person.
Here's a trick for you...
When you do this, the company who has registered the domain you searched for, is just "tasting" it to see if it has any traffic.
So if you go there after you search for it and find it registered: DO NOT VISIT THAT PAGE AGAIN. AND ESPECIALLY DO NOT CLICK ON THE ADS.
99% of the time, the domain name will not get enough traffic for this company to hold on to it, and after 5 days the domain will come available again.
This trick has worked many times for me.