(1) BeatMyPrice - Community powered price comparison site that helps you find the best price on products. You enter product details, price and the URL where you found the item. If someone finds the same item for less, you are offered the result, otherwise your link is saved as the cheapest one. Read more: BeatMyPrice - Find the Best Price Online.

1. Find the best price you can online
2. Visit beatmyprice.com
3. Enter the details
4. See if someone has found it cheaper elsewhere
5. Save! (otherwise your price becomes the one to beat)

(2) Blist - Create comprehensive lists, be it a simple personal list or an advanced database. You could embed things like images, pdf files, word docs right beside a name in a spreadsheet etc. Read more: Blist - Create And Share Comprehensive Lists On The Web.