ProDOS software for IIe

[Cindi Ellen O'Connor <cindio@cindio.mv.com>]

My 11 year old son has an Apple IIe with 5.25" double disk drive.  
He would like to do some basic functions like copying disks.  The 
manuals that came with the system mention ProDOS.  I did read 
through a FAQ on this newsgroup and found mention of Edlie 
Electronics selling "The ProDOS User's Kit".  I was wondering if 
there were any other sources for this software or if there is 
another program he should use.  Thanks for any suggestions.
Cindi Ellen O'Connor
cindio@mv.mv.com