"Keeping an eye on hardware prices is essential if you want to
become a certified cluster geek. Remember those gigabit Ethernet
switches that cost an arm an a leg, or how about those DDR DIMMs.
Today those price seems to be a bit more in reach. Perhaps the
extreme in low prices, came when Walmart introduced a $200 PC built
from 'value parts' (i.e. very low cost PC hardware). Some quick
math says, an eight node cluster could be built for less than $2000
and gigabit Ethernet could be added for another $500 and presto,
you have yourself a cluster..."