Double the speed of Deep Blue, remember that computer IBM built that beat Gary Kasparov at chess? Local computer science professor at Calvin College, Joel Adams, makes a 26.25 Gflop computer for about $2,500.  

Design goals, according to Adams:

Tim Brom, senior student, and I received a small in-house grant of $2500 to try to build the system. The goals of the project were to build a cluster:

• Costing $2500 or less
• Small enough to fit on my desk, or fit in a checked-luggage suitcase
• Light enough to carry to my car (by hand)
• Powerful enough to provide at least 20 GFLOPs of measured performance:
  • for personal research
  • for the High Performance Computing course I teach
  • for demonstrations at professional conferences, local high schools, and so on
• Powered via one line plugged into a standard 120V wall outlet
• Running at room temperature

Mission accomplished.

http://www.calvin.edu/~adams/research/microwulf/