http://www.dealextreme.com/details.dx/sku.5503 that's the adapter lead I use
http://www.dealextreme.com/details.dx/sku.26465 that's the 2xAA -> USB power I use.
Note: with 2xAA in it (rechargables) it does not fully charge the PRS700 I have, but it does get it up from dead to 3/4 full, which is plenty for me
It DOES come from DX, so that means the quality isn't awesome, but for those prices I'll risk buying a lemon every now and then. So far these two items are holding up well.