What are some tips or apps for tracking prices between big box stores and online? What about deal trackers?

I am trying to be more frugal as I have too much CC debt thanks to endless repairs as I just bought a house.

Comparing prices for items like PVC pipe or conduit or whatever is tedious between Lowes and HD. Both their apps kinda slow and doesnt alwaya show what is in the store.

Just looking for if anyone has tips to easily compare items between the two.

Also deal tracking, like when you need a tool at HF or similar but it isnt on sale right now but might be at certain times of the year or with promos. Whats your go to app or site for deals? Too many of them have too many ads or spam etc