The six-core Intel Core i7-970 processor we've been waiting to hit the Mac Pro has shown up for sale at Newegg, priced at a not-inconsiderable $899.99. That gets you six 3.2GHz cores complete with 12MB of L3 cache, 130W TDP and both a heatsink and fan.
Of course, it also supports Intel's Turbo Boost overclocking technology like its faster - and more expensive - Core i7-980X sibling. Newegg are limiting sales to 10 per customer - do you have $9k lying around to spend on CPUs? - and beyond this we're not expecting new Core i7 hexacores until sometime in 2011.