GetDomains.info

It’s quite simple, type the word you wanna find most common typos on your computer 10 or 15 times very fast, without thinking, without reading, just type them fast. Then read back, you will see one or few natural typos.
You want to find more ? Ask your wife or your friend to do it, you can get one or more variations this way.
If the domain is related to a language, be sure to use the proper keyboard, use a french keyboard for a french typo of course.
Good luck!