I think the books are over £100 or something absurd.
The books I've used are Peachpit Press ones which I think are the official ones. They're good, I suppose. They're the proper reading for the test so that's all you can say really, they directly prepare you for it.
I'm not super clued up on costs because mine have been paid for by work, but I can vouch for Amsys in terms of training if you're down south - they'll either provide you with the full course, with the aim of really teaching you, or fast track you through the exams if you know what you're doing and want to save money. They're friendly and they know what they're doing.