Cheapest on Staticice: http://staticice.com.au/cgi-bin/search.cgi?q=6990+price%3A60…
Expensive and I'm not a fan of the absurd amount of fan noise (no pun intended), but some of you may be in the market for it.
Promotional price! (while stocks last) The VTX3D HD6990 4GB is designed to be the fastest single card solution. The massive power offered by the HD6990 comes from 2 GPU cores running at 830Mhz, each with 2048MB 256-bit GDDR5 running at 5000Mhz. Output sockets for 1 x DVI-D and 4 x Mini-DisplayPort. 2 year warranty.
Immerse yourself with AMD Eyefinity technology and expand your games across up to six simultaneous displays. Purpose-built to dominate your gaming competition in the most advanced DirectX 11 titles, the AMD Radeon HD 6990 is at the time of writing, quite simply the fastest graphics processor in the world. Experience the incredible power of dual GPUs armed with full support for Microsoft DirectX 11 and scalable geometry processing, for unrivaled performance and flawless image quality.
I wouldn't call a 1.33% saving ($10) off the next closest vendor a "bargain".