Amazon guide details Alexa price alerts and Auto Buy limits
Engadget outlines how US shoppers can track Amazon prices and set alerts, while automatic purchases are restricted to eligible Prime members and exclude discounts.

An Engadget guide published on 28 September explains how US shoppers can use Amazon’s Price History and Alexa for Shopping to monitor prices and receive alerts. The guide describes existing tools, rather than announcing a new Amazon feature.
Price History displays changes over 30, 90 or 365 days. Shoppers can use that history to choose a target price, or ask Alexa for Shopping to watch an item and send an alert when it reaches that level. Price alerts do not require a Prime membership.
Eligible Prime members can also ask Alexa to buy an item automatically once it reaches a chosen price. The purchase uses the customer’s default payment method. Engadget says the guide does not specify which members or products qualify.
Auto Buy does not apply coupons or promotional discounts. Tax and delivery charges may also affect the final total, so the selected price may not match what the customer ultimately pays.
Alexa for Shopping is available to US customers through the Amazon app, Amazon.com and Echo devices. The guide also notes that CamelCamelCamel and Keepa can track Amazon prices and send alerts, but cannot place orders.

