Tools for find prices for hardware parts

I typically put in a good description into Google and get good search results for doing so. Vendor sites, electronic stores, Amazon, and so on. This is what I do the great majority of the time.

i need to check prices for a lot of thing , that's why i ask for any tool

When the item I want comes up, I normally get pricing with it.  That is why I use this method.

I agree with John and, if you need something specific, I use the following general rules to start looking deeper:
1. Manufacturer's site - For something specific
2. NewEgg - For general pricing on most anything
3. CDW - Prices can be higher sometimes but sometimes carry new parts (or the devices themselves) for discontinued models / devices
4. Amazon & eBay - Additional general sites

The hard part with "free aggregators" are ... they usually seem to be biased more than objective. I briefly looked at pricewatch.com but I don't see too much objectivity on their results.

The other thing you could do is open an account with a bigger distributor (i.e. TechData, Ingram Micro, etcetera) but they sometimes come with purchase / selling level commitments.

Some spare part vendors have mobile phone apps to look up specific part numbers and stock locations, HP partsurfer for example but as above the web version is just as good.

Something like Partpicker ? that's the best tool, it does all the heavy lifting and comparison for you, and you then don't have to waste more time vising lots of different websites and wasting time ....

You can select your parts, it will list and display a list of vendors, based on price, and you can build a PC and it will total the cost as you go.

https://pcpartpicker.com/

https://uk.pcpartpicker.com/