Octopart, you let me down!
Yep, sometimes the most obvious is the best. I have even seen folks overpay for parts on e-bay when the distributors had them listed for less and without the 3-week shipping time from China.
If you need a couple of SAM3X8Es, just contact Atmel directly for samples. The problem is the test sockets. They are expensive...unless you have skills soldering.