Actually, you can go into any comic shop and have them order it for you.
All you need to tell them is the name of the book, that it is in June Previews and that the order # is JUN05 2763 and that you want them to order it. Retailers are used to the trend of customers pre-ordering now that Diamond is so collector-friendly.
And if he gives you a hard time, whip out your cutlass and gut him in front of his customers.