The SX10 has a standard flash mount, which will fit just about any flash unit. The manual recommends the Canon Speedlite 220EX, 430EX II, or 580EX II units. Other manufacturers' flash units will also work, though perhaps not as automatically.
The big thing to watch for is that older (film-era) flash units may have higher trigger voltages that can fry newer digital cameras. Before buying such a unit, check
this list.
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