What are some alternatives?
When comparing Shopods and Keepa, you can also consider the following products
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
PriceAlarm.net - Quick price comparison in all Amazon and eBay shops. Price History and Price Tracker inclusive.
Savelist - Found products you want but not ready to buy?
Penny Parrot - Get price drop alerts for products on Amazon as well as historical pricing to find the best deals.
Price Snoop - When viewing a product on Amazon, Price Snoop will show you just how much it costs on the other...
Waatcher - Automatically buy on Amazon at your target price