I planned to do this one. Check with the law, like talk to a lawyer or someone in the consumer ministry. Prices were protected under law in our case. It wasn't

I planned to do this one. Check with the law, like talk to a lawyer or someone in the consumer ministry. Prices were protected under law in our case. It wasn't legal to crowdsource it; stores had to share it willingly. I'm not sure of the Act is still there, but we ended up pivoting around it. You can skirt laws like Uber did and sometimes change them. But be aware of the how far you can skirt them. If you're making a political statement, be extra careful. In our case, shops were unhappy because of the business model. They overcharged on some things and made others look cheap, but to whomever they targeted, they wanted to look cheap. When we compared a grocery list between multiple shops, it turns out most had similar totals. It would have encouraged user behavior where they buy chicken in this shop, salmon there, diapers in another shop. And because all of these were loss leaders, it would have been bad for the stores overall. Also consider the protectionist environment that brings about tariffs and the current hostile climate against "tech bros", and it's a doubly bad idea - if the law doesn't get you, the mob will. But if they share it with you willingly, it's normally legal and less work. We had a phase when implementing GST where companies would advertise that they were not raising prices. All you have to do is verify this. You can even charge an advertising fee.