B&H offers the Apple Mac Pro Desktop Computer (12-Core, Late 2013 MD87816/A) for $8,799 shipped. That’s $800 off the regular price and the lowest we can find for this configuration.
It has a 12-core 2.7 GHz Intel Xeon E5 processor, 64GB of 1866 MHz DDR3 ECC RAM and 1TB of PCIe-based flash storage. There are also dual AMD FirePro D700 graphics cards with 6GB of GDDR5 discrete VRAM each. Also, it carries six Thunderbolt 2 ports and it ships with Mac OS X 10.10 Yosemite.
B&H also has a handful of MacBook Pros/Airs on sale and up to $300 off.