If you want free typein names the easiest to find are misspells.
The Overture tool is pretty clunky these days, but if you check the names WITH the .com included its a pretty good indicator whether they get typeins or not. Three word names rarely get many typins.
Want a sample? Heres on that seems to be available that will get 20-40 typins a a day:
switchbored.com
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http://inventory.overture.com/d/sear....com&x=14&y=14