Very expensive, they are heavy walled and heated with temperature control. If you have access to a university lab, often they have nice vacuum ovens sitting around empty - doing nothing. Make one if necessary. Leave for a few days. Once dried down, they will of course begin to absorb moisture once again and get musty.
Incense is a nice choice.
There are so many different fragrances you can always find something to please. Prop the top-side cover open a bit. Close the door and let it set overnight. The book will smell like vinegar for a day or so, but one time is usually enough to take care of the problem. This is a direct quote from the following Morse, Sydney .