Water Powered Clock @ Jaycar Electronics $19.95
I was originally just going to post this because of the novelty value but its having a look around its a good price as well. You can get a range of water powered clocks (I had no idea they even existed) with prices as low as $7 (Jaycar again) but I like this particular one with the two bottles either side.
The nearest other price was $24 for the same clock, although you may be able to find cheaper.
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