OctoShop for Chrome - Compare prices and get alerts when things are back in-stock
alphasense - AlphaSense finds information on companies, data and themes from within millions of research documents in seconds, all with ONE simple search.
HotStock - HotStock is an all-in-one real-time product tracker for you that allows you to find the right product, exclusive deals, and discounts from all the major online stores.
BamSEC - Financial research made easier
Wikibuy - Find lower prices at other sellers while you shop on Amazon
YCharts - YCharts is a financial software solution providing investment research tools including stock charts, stock ratings and economic indicators.