How I Track eBay Prices Without Losing My Mind

I’ve been flipping on eBay for a while, and one of the biggest challenges for me was keeping track of price changes across multiple items.
Manual spreadsheets and saved searches worked at first, but as soon as I started following dozens of products, it became a mess.

I tested a few tools, but most of them were either too heavy, expensive, or built for enterprise users.
Eventually I ended up building something lightweight for myself that alerts me when prices shift this way I don’t have to sit refreshing listings. It made it way easier to decide when to buy or relist.

If anyone’s dealing with the same headache, I put it online here: zbirkaprice.com. It’s simple, nothing fancy, but it gets the job done.
Curious if anyone else here tracks prices in bulk and what methods you’re using?