This app was mentioned in 4 comments, with an average of 4.50 upvotes
Shop Savvy provides some product descriptions and extra info. It lets you save your scanned items for later and will search for locations nearby and online with the lowest prices for those items.
https://play.google.com/store/apps/details?id=com.biggu.shopsavvy
There sure is: shopsavy
There's a bunch of apps on Google Play. ShopSavvy seems to be popular. Also, Lifehacker wants to help. For online purchases, I use PriceBlink.