Hmmm. A search for "Irwin Silber" at Barnes & Noble brings up an interesting variety of books, including Folksinger's Wordbook. A search for "Blood Patterson" brings up Rise Up Singing - the spiral-bound edition is listed as "other format" (paperback is immediately available, but not as easy to use - better to wait the 1-2 weeks required for spiral).
A search for "Alan Lomax" brings up the paperback edition of American Ballads and Folk Songs, and also a new reissue of a terrific collection of songs for activists, Hard Hitting Songs for Hard-Hit People.
As I stated above, you may like 500 Best Loved Song Lyrics from Dover Press, which is a good tool for group singing.
A search for fake book will bring up a treasure chest of books, but they're quite expensive. Still, maybe $36 isn't a bad price to pay for tunes and lyrics to 1200 or more songs. My favorite is The Ultimate Jazz Fake Book from Hal Leonard, and Warner's The Most Fantastic Fakebook In The World (get a load of THAT title).

Oh, by the way, Sing Out! is at http://www.singout.ORG/
-Joe Offer-