Hi Dave,
It's been discontinued in October 2005
http://discussions.apple.com/thread....sageID=1019791
How much RAM and what specs does your mum have? Maybe it could be worth getting 10.3 install discs and upgrade her system. 10.3 should run where 10.2 does, and as long as you can upgrade it to 512 MB RAM (or more) it should be smooth, and it is very stable. The install discs should be very cheap at eBay etc.