The Asus and Sapphire Radeon HD 3870 X2 1GB graphics cards appeared on the website of Dutch webshop Salland Automatisering.
According to earlier reports this dual-GPU card will be released on January 23rd and the Salland site claims users who place a preorder will receive the card within 1-10 days. The Asus card costs only 382EUR (incl. VAT) while the Sapphire preorder is offered for 425EUR (incl. VAT).
I'm not sure if these are the final prices but they seem to be about twice the price of the Radeon HD 3870 graphics cards, these retail in the Netherlands for about 195-220EUR.