Disclaimer: I'm not affiliated, just a cheapie looking for ways to save on groceries.
Now that the grocer app and other groceries price comparison websites and app are quite popular. I wish someone would create that price trend browser extension like the one available in Aus.
Coles Trend
https://chromewebstore.google.com/detail/coles-trend/ehgelge…
Woolworths Trend
https://chromewebstore.google.com/detail/woolworths-trend/dm…
https://files.cheapies.nz/upload/485/5320/price_trend_coles.…
https://files.cheapies.nz/upload/485/5321/price_trend_woolwo…
Aware of a group of Prof. master of compsci. students drumming up something in between pricespy and grocer (and has a camera element for lookup iirc).
I hope it turns into something!