In Germany at least
We stumbled upon a rather nice deal made by Mindfactory.de e-tail shop that currently offers two Radeon HD 7970 cards that sell below €500 as part of the "special price" deal.
The cards come from Powercolor and Sapphire and are pretty much the same considering that all cards currently on the market are based on the same reference design. The Powercolor one is selling with a price set at €489,82 while Sapphire's has a €499.89 price. Both cards are currently in stock but with such a price we are pretty sure that both will sell like hotcakes, mostly due to the fact that some retail/e-tail shops are currently selling those same cards for as high as €549,99.
Mindfactory.de also lists Club3D's Radeon HD 7970 for €450,93 but unfortunately it is not available and there are no details regarding the availability date.
You can find them here.