This flipper zero app enables you to tamper with ESLs:

https://github.com/i12bp8/TagTinker

Writing to them would of course be useful, but simply reading the tags could be quite useful too. As we get hit with personalised pricing and prices of goods fluctuate like stocks, it would be useful to grab prices programmatically as we walk through the store. The prices get fed to a DB to build a price history. This has a couple benefits:

• it could alert you when something you buy regularly is cheaper than recent history
• when a store ad says “today it’s $5 (normal price: $10)”, your DB can confirm whether the ad is lying about the normal price