Go to where you installed the game. Find a file data.big (something .Big) I did this A while back so I can't remember the name. Anyways, open the file with notepad or another Writing application (not word pad) (if you use word pad It will be unreadable)MAKE A BACKUP BEFORE EDITING. You can change prices and all kinds of stuff. Just look through it and edit what you understand. I will post again with most of what you can edit. I am sure it works. If not please post that it doesn't and I will recheck To be absolutely right. Hope I helped!
There are currently no known codes for this game but hints and tips on the various stages of the game can be got by going to the SuperCheats forum for The Lord of the Rings, The Battle for Middle-earth or by asking questions at the SuperCheats Q&A section or reading the FAQ/Walkthroughs we have for this game.