You will be given the unique opportunity of being able to purchase Witness: The White Volume from all good bookstores. If the bookstore in question simply isn't upmarket enough to have had the good graces to stock enough copies, present your demands to a counter clerk.
If after drawing your sword the counter clerk begins to quail you must remain strong in your resolve. Anyone who goes down in the name of darkness will have their name whispered in Belials ear on judgement day.
Darkest days and nights...