I assume you got the unit used? I would try ebay to start for a new power pack. If you buy I used one you don't know how many charges are left. There should be a battery/power supply outlet near you? I find they usually have better than OEM power supplies.
I did try online but the price was rediculius on clist it was no more than 100, also didnt kno these things had a number of charge before they die thought it was plug and play.. I believe it's a 115 v power source but can't find any cheap on line