Most likely the demand for them has increased, causing them to raise their prices.
Any more details? It just doesn't make sense to me to raise the price after all this time, but I don't know much about the market.
Will this affect the prices of the new chips coming out in April?
Oh, and the everyday price has been a solid $219.99 on Newegg since I got one last June (besides the occasional promotions of course).