Netgear doesn't sell replacement power supplies. Your best bet is to see if someone on fleabay is selling one or just buy a matching 3rd party supply. You just need to make sure the output voltage and polarity are the exact same. You can have a higher amperage but don't have less.
Wouldn't it be awesome if Netgear sold replacement power adaptors for all their range in whatever country format was required or created a universal one with an interchangeable power plug adapter? I'd probably purchase a spare or two to have in reserve.
