Need a particular song or arrangement? Checkout www.sheetmusicplus.com, (opens new page) they have one of the largest selections of music books and sheet music available anywhere. Their site also has good search facilities to find what you want, AND include content indexes for most their music books.
There's a Boat Dat's Leavin' Soon for New York
There's a Boy Coming Home on Leave
There's a Broken Heart for Every Light on Broadway