Eyes of the Dragon by Stephen King. Purchased at Fictionwise. Many typos, missing punctuation. My guess is that they OCRd to generate the ebook. I would think any kind of proof reading/spell checking would have turned up many errors.
Dead to the World by Charlaine Harris. The table of contents and chapter titles are wrong. Chapters are titled "~1", ~2". If you go to kobo books, you can see the problem just by looking at the web page for the book. I thought this was kinda funny as the table of contents and chapter titles appear messed up even at the most cursory review.
I purchased both of these at Fictionwise. They were very nice to deal with. I told them I didn't want a refund (as I had read the books), but they gave me one anyway.