Instruct: Classify Amazon reviews into positive or negative sentiment
Query: How dare you suddenly drop the price after the pre-order!!!!!

I am very unhappy with Amazon. How dare you sell the Bluray for $16.95 (2 weeks after pre-order) after selling us on the pre-order for $19.95? This is not ethical. In this case you all should never pre-order. In fact pre-ordering is to help the retailer on matters of inventory planning.People who bought on the pre-order, demand our money back!