OctoShop for Chrome - Compare prices and get alerts when things are back in-stock
Random User-Agent - Automatically change the user agent after specified period of time to a randomly selected one, thus...
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.
User-Agent Switcher and Manager - spoofs browser's User-Agent string.
LineScouts - Rate queues in stores to keep the vulnerable safe.
30 Seconds of Knowledge - Become a better developer, in every new tab.