Price Compare is now available on the Amazon app store.

Features:

• By entering price, amount and a unit type (such as grams, liters, pounds or gallons) you can compare against previously entered prices instantly. Conversions between imperial/metric are performed automatically.
• Categorize products under one or more categories.
• Track stores along with prices to build a price history.
• Use a star rating to rate product quality when comparing across various brands
• Supports metric and imperial system (mg, g, kg, oz, lb, mL, L, Liquid Oz (UK), Liquid Oz (US), Gallons (UK), Gallons (US)
• Quickly compare various quantities of items to find the best deal.
• Many opportunities to compare and save, from groceries to gas, track anything that is sold by mass/volume.
• View both via $/Amount and Amount/$

This app is a great way to find hidden deals given price inflation for food this year.