Does a best-seller book author make more money if I buy a book at full price?

I was at Costco today and bought the new Daniel Silva book. I have loved everything else he wrote, so this was a no-brainer.

I paid $15.29 for it. Amazon shows it at $16.79+shipping. barnes and Noble online for $17.29. The local B&N store $19.59. And list price is $27.99.

Does the author (in this case Daniel Silva) make the same amount, no matter which bookseller I choose, and no matter what price I pay?