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The board used (VCU118) is $7000.

As noted the Digilent Arty is $99 and hosts up to 32 cores. The XC7020 Zynq devices should host 80. That includes the Zedboard, the original Parallella kickstarter ed., the forthcoming Snickerdoodle Black (?), and the Digilent Pynq which is $65 Q1 for students. It is my intention to put out a version of GRVI Phalanx for 7020s, at least a bitstream and SDK, perhaps more, but much to do. Note the 7 series (including XC7A35T of Arty and the XC7Z020) have BRAMs but not UltraRAMs so those clusters have 4K instruction RAMs and 32K shared cluster RAMs. The 4-8K/128K clusters possiblr om the new UltraScale+ devices afford more breathing room for code and data per cluster.