You could try eBay. Put it out there and let those interested fight over it. If you get a few people that are really interested you can really come out ahead.
Not sure if this is off topic or not,I'm selling an original copy of The Book Of Thoth signed by Crowley himself this book is only 1 of 200 and because of the value of it i was wondering if anyone knew of any reputable Occult or any rare bookshops that may be interested in such a purchase....thanks in advance.