www.pcb-pool.com can do that tech, but they have a minimum order of 16 sq in. You can order 16 of your board, I suppose. Batchpcb's 4-layer service would be ideal, if not for the long turnaround times. Minimum size 1 sqin for $8, plus s&h.
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Re: [Homebrew_PCBs] OT - prototype source
2009-02-21 by DJ Delorie