Hi, Billy - Stan Hugill's 1961 Shanties from the Seven Seas was reissued in 1994 by the Mystic Seaport Museum (click here), but I couldn't find the book listed at the museum store. There were several copies there when i got mine in November, so maybe an e-mail would help you get one there. It's listed as immediately available at Amazon.com, and special order at Barnes and Noble. The only complaint I have about the Hugill reissue is that the lyrics should be in a larger or less ornate font, because they're very hard to read.
Another excellent book of sea songs is William Main Doerflinger's Songs of the Sailor and Lumberman, available at Barnes and Noble. I've found with these online bookstores that if the book is available for shipping within 24 hours, you'll get your book. If there's any indication that there may be a delay in shipping, you may or may not get your book.
Both of these books are trade paperback reissues. You may wish to look for the original hardcover versions at a used book store, perhaps http://www.bookfinder.com/.
-Joe Offer-