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OK sorry if this was posted, but I haven't got time to read the whole thread.
From my experience buying USB gadgets from Hong Kong on Ebay, the chargers typically supply standard USB juice (5V), and they seem to use exactly the same plug & polarity - it's probably a standard, or at least the cheapest way to do power (source the adapters etc). It obviously makes the power design simpler, especially if the gadget can already charge off USB. It also makes sense to have the center positive, as people are far less likely to short that out accidentally.
The generic 5V USB power supply that came with one of them worked on 3 out of 4 gadgets (the 4th, a 2.5" hard-drive based media player, requires slightly higher voltage (5.6V), but it's still the same plug/polarity).
Check out Ebay for USB chargers. Some just provide a USB socket - you can buy USB -> power connector cables (again tons from Hong Kong), I've got a retractable one - but some should also have the right connector.
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