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View Full Discussion I got the Seeed Rainbow Cube last year.
It was 4x4x4 at $75. As others have mentioned, this drop has 8X as many voxels.
These use addressable LED's, so there are only 3 wires per LED (power, ground, and signal) and they daisy-chain.
Addressable RGB LED's are typically about $1 per LED when buying discretes, and $0.40 in a strip. It would be difficult to buy the raw materials for much less than the $290.
It's pretty cool, and I totally believe that it's pretty expensive to build. Still, not $300 worth for me, sorry.