This great module is listed on the courtesy of DataKick. 

Not only is this a powerful incentive for them to return to your shop, but it also gives you interesting information - email addresses and expected price. You can use it to optimize your pricing strategy or for other marketing purposes.

Features:

• Automatically sends email when price drops
• Alerts can be created by anonymous visitors as well as registered customers
• Supports product combinations - notification can be set for specific combination only
• Supports multiple currencies
• Easily change change email template
• Modern design

Accessing Data

Module itself doesn't have any functionality to export price alert data, but it is integrated with DataKick module - your price alerts data will be available for creating lists, xml exports, inline editing and mass updates just as any regular record type. 

GitHub Page