What are some alternatives?
When comparing Shopods and Penny Parrot, you can also consider the following products
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
PriceAlarm.net - Quick price comparison in all Amazon and eBay shops. Price History and Price Tracker inclusive.
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
PriceSpy - PriceSpy helps you save money when shopping online.