So sorry to hear about your recent theft!
It's a standard 5-pin mini usb cable. If you do a little googling, you can find versions that also have a plug that works to charge the device from USB, intended for the PSP. Here's the one I found on Amazon, works like a dream and only cost $2.50:
http://www.amazon.com/Insten-2-1-Dow...dp/B000F1TNCA/
Handy to have the power plug to charge your reader from a usb wall plug, or charge from the computer without going into data transfer mode.
Good luck getting things back to normal.