Found a bunch of these DSE iPad PC USB adaptors today selling at just $1 (a friend of mine purchased one just recently when were on sale at $8, down from $10).
Although iPads can be charged from most Apple computers directly from the USB port, this is not the case with many PCs. This adaptor allows iPads to be charged to any USB port.
I bought 4 of them (work PC, home PC, laptop and a spare) for a grand total of $4.
I believe this is in-store only as it is no longer showing on the DSE website.
Drawing more power from a PC usb port isn't exactly a good idea