Site/App to alert me for price drops on items?

[thatsright]

I'm looking to buy a camera lens on bandh.com or adorama.com (or others). It's full price now, but there are often sales on this one item. Is there a site or app that will scan the site(?) for this one item and then alert me if the price goes down? Both sites don't have an 'alert' feature that would do this.

 

[jlee]

There are any number of websites that will alert you to a change in the site - https://www.hongkiat.com/blog/detect-website-change-notification/

I'm using https://distill.io's Chrome plugin.

 

[dud]

Camel X3 ...