Easily view historical pricing data from camelcamelcamel.com.
Camelizer told me the first item I selected was not in stock but Amazon says it is. Advertising for this extension said you can sign up for alerts for "any" price drop but the extension actually requires you to set a price yo want to pay. I would prefer to be notified of price drops and if they meet my wishes then I'll purchase. In short, this extension doesn't do any better than the Amazon Price Alert extension. And who cares what the history is, what's important is to be alerted when the price drops. Then you can decide.
UNA VOLTA ERA UNO DEI MIGLIORI, ORA NON E' PER NIENTE PRECISO!
Doesn't properly show or track prices, often just shows the "full price of the item" or third party sellers only.
https://keepa.com
https://www.fakespot.com/
amzbase
https://priceblink.com
https://cnet.com
http://pricescout.io/
http://redditenhancementsuite.com/
https://amzscout.net/
OR Interactive
http://reviewmeta.com/
https://howmanyextension.com/
http://andryou.com/