Looking for something that I can quickly check different items in a store to see if they are worth reselling without taking a bunch of time to manually type in description in eBay and check sold prices. I've tried a couple of the barcode scanner apps that supposedly tracks prices but they never find the item. Maybe the ones I used just weren't good?

I am a casual eBay seller but have recently picked up the pace. Not on an eBay business account yet.

I do a good job in Excel tracking items that sell, eBay fees, as fees, postage, etc. so have a good idea of item profit. So far I’ve just been selling items found in my family basement so cost of inventory is $0

I am wondering is there a good site/app that helps with sales tracking if I start buying items at garage sales and then listing. I know I can just add to my excel. But also thinking down the line how eBay only maintains items for like 6 months, and the. The listing and pictures are lost. Is there something that will help me manage?

I suspect I could be neglecting some great tools due to ignorance. Which ones do you love? Which ones did I forget to mention? Any horror stories? General advice appreciated..

EDIT: Thanks guys!