Jim's music is published by "Music Files Ltd" and some of his original works and arrangements are on sheet music specialist sites: Sheet Music Plus and Score Exchange. These are available to purchase for immediate download (including scores & parts where applicable), and many provide audio and video too. A list of these tracks grouped by category is available on Music Files.
Jim also manages the mfiles website with a lot of classical sheet music and traditional sheet music. All these pieces are free for personal use but can also be licensed for commercial purposes - see the contact page.