Five, everyone actually

A friend of mine Jayson Tautic use's www.batchpcb.com or used to, he's got a little review on his website for them you may like to read, here is a quote:
I’ve been using batchpcb.com for a while now, and have been truly impressed with their services. Yes, getting boards back takes a while, but I’ve yet to find any other source for getting professional prototype pc boards with solder mask and silkscreen for a competitive price.
I'm trying to find his post about the PCB's he use's now, the purple ones. The way they are made is a few people send in their pcb designs and then once they have enough to fill a sheet the order is sent in and everyone gets their pcb's made at the same time, so like a group buy kind of thing.

EDIT: Just found the link i was looking for: OSH Park ~ Welcome

This is a community printed circuit board (PCB) order. We take designs from lots of people, put them all together on a panel and then order the panel from a fab. Since we're all splitting the panel setup cost, this lets us make circuit boards inexpensively.

This service grew out of the DorkbotPDX PCB Order run by @laen and now comprises of a two-layer panel every other day, a four-layer panel every three weeks and a periodic two-layer medium run service for people needing more than 150 square inches of board.
Not used either of them myself yet but they both look quite good ?

.Me