You can buy a
PSP adapter, which looks the same, and is the same voltage and current output as the PS3 AC adapter, for less than $4 US on eBay - and that includes shipping. It's actually less expensive that some of the USB to DC power plug adapter cables. I wouldn't be surprised if the eBay items were made in the same Chinese factory as the adapters with Sony's logo. If it makes you feel better, or more secure, to pay ~7 times more for a charger with Sony printed on it, then go for it. Sony appreciates your patronage.