Even most of the ATI's AIB's told us that they expect to get most of its RV630 chips and to ship the Radeon HD 2600XT cards toward the end of the month some vendors already decided to ship the cards.
The cards are already available and the cheapest one we could find is Palit/XpertVision Radeon HD 2600 XT Sonic, 256MB GDDR3, 2x DVI, TV-out, PCIe available in German etail store for €98.65 + the shipping cost.
The chip is a bit de-clocked and works at 700 MHz while most of the other vendors will ship with 800 MHz chips and the memory works at 1500 MHz but 128 bit memory interface only.
You can get Palit here and most of the others will be available next week. We have to admit that the price is awesome.