I like this idea a lot -- feels like there's a lot of room to grow here. Do you have any sort of historical price tracking/alerting?

And/or also curious if there is a way to enter in a list of items I want and for it to calculate which store - in aggregate - is the cheapest.

For instance, people often tell me Costco is much cheaper than alternatives, and for me to compare I have to compile my shopping cart in multiple stores to compare.

Cool! I hope it's coming to Japan (I live) near future.