是否有一种简单的方法可以从主要零售商那里获得产品信息（价格，属性，商店可用性）？

I am looking to build an app that will require info from multiple stores (mostly big retailers, wmt, Amazon, Home Depot maybe, etc) about their product offerings. Most of the info I will require is available on their respective websites, but I was wondering if there would be an easier way to get certain info (such as item name, price, attributes like color, size, and ideally store availability) in an efficient and application friendly manner. I would like to be able to extract this data to a database (or maybe an object which only lives in memory), and go from there to analyze as much as I can get.I am looking to build an app that will require