I thought I'd be able to print them at home but then realized that a 50 page booklet isn't easy to print if you don't have a duplexing printer. So I thought I'd have it done at Fedex Kinko's. But they didn't have the paper I wanted so I bought that from the Paper Zone and brought my custom stock with me. The black cardstock was thick and with 12 pages of paper the booklets had to be trimmed to look their best. After the hours I'd put into them I figured $5 extra was worth it.
Then I had my husband design the labels using a Hogwarts crest image I found on the internet. We made some modifications in Photoshop and printed them onto full sheet (8 1/2 x 11") labels I purchased at Office Depot. I then cut them with a paper cutter and applied them to my booklets.
I was surprised at the amount of time and money these booklets took but in the end it was worth it. The kids loved them. I anticipate my kids will use them for years. There are references to the books which I hope are accurate but figure if they aren't it'll give the kids something to do to check them.
The finished cover.
The title page. Obviously we aren't real publishers this was just to make them look authentic.
There were three sections: Charms
Spells
Potions
Each section had a place to take notes at the end.
The Spellbooks on display in "Diagon Alley".
*Edited on 8/20/10. As I said above I got the information for my booklet off the internet. It would be illegal for me to sell the booklets and I don't feel comfortable giving them to others. If you want to make them yourself that is your choice but as I warn, it was a LOT of work and they are expensive to print. How I did it is explained above. For those whove been unable to find the spell information themselves you can find a list of the spells on Wikipedia and the potions and ingredients at The Harry Potter Lexicon. There are probably other sources for this information as well.