I have the Canon versions at work where they are used with a 5D and 6D mounted to microscopes. Looking at those adapters, I simply cannot understand the pricing. It's a wall-wart power supply with a faux battery on the output end to mate with the camera.
Were I buying an AC supply for my own use, I would research the aftermarket manufacturers and buy one of those. Do keep in mind, though, there is more to one of these supplies than simply supplying the correct DC output voltage. A multimeter may read precisely the correct DC voltage, but that's not the whole story. Cheap DC supplies tend to have a lot of "ripple," that is, an AC signal that leaks through. Setting a multimeter on AC and testing the supply voltage should ideally result in a 0.0V reading. There will typically be some ripple, but it should be minimal. Excessive ripple can cause problems or damage the attached electronics. The other consideration is surge suppression. I don't know how well protected the Canon supply is, but I would bet that the inexpensive supplies are not well protected.
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