BTC real-time price tags

[Joohansson]

Fiat price tags changes with the market over time so a product has a correct price. How does price tags for BTC work today when you buy stuff? Do they have a static value or changing once a week? BTC market is crazy today and it's hard for stores to adopt because no one will buy a computer for 1 BTC when that coin is 10% more valuble next day.

The solution to this would be a system that changes the price tag in real-time by some sort of mean value from the complete BTC market. Then a computer would always has the same value compared to other currencies, whenever you buy it. 1 BTC now and 1.01 BTC next minute. Or does this already exist?

[morefeeus]

Bought a miner on Friday, the company gave me a URL to the exchange ticker they use for pricing, it allowed me to decide when to buy... It was varying +- $60 at the time... Never had to buy anything that way before! That's really going to be a problem for most people.