You could always look for an abandoned website in a similar sector to yours, that has traffic. Then buy it. There's some great bargains to be had out there.

The best $500 I ever spent was on purchasing ircatwork.com which at the time had a default cgi::irc install on it. It did however have traffic - 100,000 visitors a month. I just emailed the owner, and managed to bag a bargain. Then just directed the traffic at Mibbit.com. Instant, cheap traffic looking for a good web based IRC client. I couldn't have asked for more.

A year on, and it now serves 1.5m visitors a month.