Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It's not really Amazon's fault.

Amazon is just the site that displays this for the seller. It's like getting mad at e*a* because one of their sellers has too high a reserve. I am frustrated too since my wife and I both have these brushes and will never be able to afford heads for them again, but I choose to get angry at Phillips (Sonicare) and the jerks who are selling these heads at rates that would make ticket scalpers blush. If you want to see who's charging this ridiculous rate, click on sellers, then if you have time you could give them a call and tell them what you think of their business practices. You could even mention that you will NEVER EVER BUY ANYTHING FROM THEM AGAIN! Yaaaayyyyyy free market!!!!