What are some alternatives?
When comparing PriceDrops and Reviewbox, you can also consider the following products
PriceSpy - PriceSpy helps you save money when shopping online.
Jungle Scout - Amazon product research made easy.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Sellics - Sellics helps you to boost Your Amazon sales.
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
A2X - A2X makes it easy for businesses to account accurately for their Amazon marketplace sales.