I literally just used this site last week to set up a price alert for a purchase.
Noticed via their chart that the item I wanted to buy (an air purifier) went on sale every few weeks from $340 to $199. I set the alert for $200, and the next day it emailed me saying the price had dropped. Saved me 140 bucks which was awesome.
Works for Amazon.ca links as well.
This has just opened my eyes. I get it now.
This whole thing makes sense.
Thank you.