Here's the Canon RC-6:
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And here's a generic version for less than half:
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Canon discontinued the old RC-1 awhile back for some reason. It was much smaller, so you could hide it in your hands. I have an old generic that I picked up in Asia somewhere 5 years ago that still works with both my SLRs. I love the thing. You might be able to find a used or older copy somewhere if you search around.
