Came across this website for an idea/application in development: http://alphatise.com/
Basically, it's an app that allows consumers to add any product to their 'wishlist' along with a price they would be willing to pay. E.g. You want a TV but for $400 less than RRP.
Sellers of the item can then see how many people would be willing to buy given a certain price (e.g. real time economic data). E.g. 15 willing at $1500, 30 willing at $1400, 90 willing at $1300. If they decide that there are enough people willing to buy at a lesser price, you'll get your bargain.
If you're not following, check the video from the site. Interested to see if people would actually use it.
There already is a platform like this, called MassDrop. It's based in the USA but ships worldwide. They do a very wide range of products, but they're mostly gadgets and other geeky stuff.
http://www.ozbargain.com.au/node/118908
The more people commit to buy, the lower the price gets.