An App called Out of Milk lets you create Shopping Lists with a Barcode or Manual Entry of Items, in the settings it has the option to Add Sales Taxes. The UI is pretty neat and I haven't had any problems with it so far. You can make different Lists for stuff you buy to keep everything organized and also different Shopping lists to buy in different stores lets say(Walmart, Home Depot...etc) Give it a try, it's free on the Android Market... Play with the settings and Add/Remove stuff so you get used to it. Tap/Long Items to move them around etc... Once you add an item either Manually or Scanned you can also add it's price and/or quantity. :) More on reddit.com

If your goal is just for online stuff, and for large prints you’d be having it professionally scanned, a flat bed will be fine for you. My V550 is excellent, and I can get really nice 8x10 prints with it.

More on reddit.com

Seems really handy! The fact that you can look up a product and immediately compare prices from several retailers is helpful because I often google prices for each retailer separately and it's just tedious. The scanning is cool and works pretty quickly. I scanned a few items out of curiosity and the app found most of the items I scanned. in terms of appearance, the website looks good I think. The app looks pretty good, but I feel like there could be some visual improvements. Design isn't my strong suit, sorry I don't have specific feedback lol More on reddit.com

Try what’s it worth or profit finder. They aren’t 100% accurate, but in my experience they get very close. You can also scan barcodes with the eBay app and find what the item has sold for in the past More on reddit.com