An adequate article would have told that you could order such a marvelous item directly here. Sheesh: it’s 2009. There’s no excuse not to give the link.
PS: There’s also this, if you’re on a budget.
PPS: If there are sites about how to build the blessed things, I’m not finding them. Tanj dammit.
PPPS: Constant Reader Matt justifiably mocks me for my lack of Google Fu.