The Radeon HD 2900XT is available in the USA and newegg has HIS, Sapphire, Diamond, gecube and PowerColor all priced at $429.99.
If you buy one of these cards before the 21st, you will get a free Logitech G5 gaming mouse. This is not bad deal at all.
At the same time people in Europe has to pay an average of €399 including VAT. We wont tell you that 399.00 EUR = 540.054 USD, but what can you do about it.
You can order American cards here or European here.