Manual and a shampooer

Question

Where is the best place and cheapest to buy a manual and a complete shampoo system for an Ultimate G Diamond Edition G7D. I bought the vacuum and all the other attachments in excellent condition from a lady for $75...was this an okay price? I had a Kirby years ago and loved the shampooer more than anything. Do you know much about this model? Thank you for your very informative help...greatly appreciated!