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oilman - 6:59 pm on Dec 13, 2002 (gmt 0)
PPC would be a decent option if you determined there would be enough ROI to replenish the account. $100 can be plenty to kickstart a campaign if it's well targeted it should support itself over the long run.
Nick's idea has a fair bit of merit to it. Finding some links has more lasting power than blowing $100 on PPC. Once the PPC money is gone it's gone.