Referring to the recent posts on this sub about strategies to spend less in sales and avoid being tempted by the deals, here are some tools that I personally use to help me understand how "good" a deal actually is.
These tools are basically price trackers with chrome extensions and options to notify you when a price drops and work across Amazon or Flipkart. This way you can plan what you need well in advance, set a tracker, check during sale period whether price has actually dropped and then take decision accordingly.
https://pricehistory.app/ - The UI is pretty good, tracks price consistently of most products I've tried and has filtering options in graph too. Chrome Extension is good too
https://www.pricebefore.com/ is a decent one too incase the first one doesn't help
Sometimes we want to compare prices across websites and its difficult for non-branded products. For those I use pricee.com or cheapshops.in
Just to clarify, I'm in no way affiliated to any websites shared. Just mentioning some I use personally.
Hope it helps people.