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We are proud to announce that we have started to sell the

CUBE4: 4x4x4 RGB LED Cube from Freetronics.

Here is the introduction from their own site:

Freetronics was created in early 2010 by Practical Arduino co-author Jonathan Oxer and technical reviewer Marc Alexander as a result of a deluge of requests for kits, parts, and other odds and ends relating to the book. Since then we've launched a number of products and we're busily creating more, following the Open Source principles of sharing our designs to let other people build on our work just as we've built on the work of others.