Only the current version so far — new entries appear as the app ships updates.
最安値サーチ – 人気ECサイトをまとめて一括検索 is a shopping app by SSPARK with 100,000+ downloads (about 423K estimated). Install growth, rank history, SDKs and ad networks.
From the store listing: “Search popular e-commerce sites like Rakuten, Amazon, and Yahoo! all at once. Get notified when prices drop. Over 500,000 downloads!”