Today I read one where the author kept trying to say that the main character did pilates. Notice I said try. What the author really said was that the main characters did palates. The first time I thought it was a typo. By the 2nd time I realized it wasn't. The author substituted palates every time she meant pilates. I can only assume it was because her spellchecker didn't recognize the words pilates (much like the spellchecker in Firefox doesn't like when I use it here).
If you can't afford an editor, beta readers are the next best thing. Yes, this does make me a hypocrite. No, I don't care, because I'm not asking people to pay money for my story.