We have a web app version.

https://www.pricecharting.com/page/app

That is a good idea.  This capability is already available for the Lot Automator.

https://www.pricecharting.com/lot-value-automater

If that tool works for your exact use case, then you can store the values for 30 days.  

Users can click "report" link next to any sale on the site and report this to admin and contributing users.  Contributors can use a page like this:

https://www.pricecharting.com/ebay/questionable-sales

And review reported sales too.

We plan to add something like this in the near future.

You can start selling and read more about it here:

https://www.pricecharting.com/sell

We consider this memorabilia and not something we track on the site.  Generally speaking, the item needs to attach to the video game system or directly interact with the system for us to add it.  Games, controllers, most accessories are fine.  An Xbox poster would not be.  PS4 neon sign would not be.  I hope that makes sense.