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cdipbig mikes is what I use. I don't have canon but I assume its the same build quality.
reason canon asks so much is because its from the creator of the camera... cant get any higher quality.
DorianFi should probably note that itis only a $400 camera (got a good deal off a local guy), and that at my local camera shop canon brand batteries are $120.
if canon batteries were only $40 i would gladly use them.