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Rico's solution is great if you're building a two-flash shot, and if you can live with one of those flashes being the one built into the camera.
If you don't want to use the built-in flash at all, your next move is either a TTL cable or a radio trigger. The cables usually go for around $30 for a camera-brand cable, less for a knockoff. The triggers cost a bit more, but they give you the option of placing the flash farther away than a cable can reach. Even the cheap ones will get you 50 feet, usually. All of the above can be found on eBay.
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