Sorry, this app is for only Japanese.
Okaidoku.net is the most useful app for shopping in comparing prices with Amazon, Rakuten, and Yahoo!.
You can find the best price easily.
Okaidoku.net provides 3-ways for searching items.
1. Bar code scan search
2. Category & Keywords search
3. Ranking & New Releases (Amazon only)
And you can manage your favorite items, and item reference histories.
Enjoy your shopping!!