Here's the subscription information I found on the Sing Out! membership page (click). Looks like it's $25 a year without the CD, $50 a year with.
-Joe Offer-

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Sing Out! magazine is published quarterly. It is available on newsstands or as part of your membership.

 Subscribing Membership includes:

•  Quarterly Issues of Sing Out! Magazine

  United States       1 year - $25.00    2 year - $45.00    3 year -  $60.00
  Canada              1 year - $30.00    2 year - $55.00    3 year -  $75.00
  Overseas, airmail   1 year - $43.00    2 year - $81.00    3 year - $114.00

Basic Membership includes the above PLUS:

• FOUR CDs, each including all the songs, tunes and teach-in examples contained in each corresponding issue of the magazine!
• Access to the Sing Out! Resource Center, a mulitmedia library of folk music recordings, books, periodicals, photographs and ephemera from the 1940s to the present (a $15.00 value.)
• A 10% discount on all Sing Out! Publications purchases (excluding bulk and box orders & special discounts)

  United States       1 year - $50.00    2 year - $90.00    3 year -  $120.00
  Canada              1 year - $55.00    2 year - $100.00    3 year -  $135.00
  Overseas, airmail   1 year - $68.00    2 year - $126.00    3 year - $174.00

Sustaining Membership includes the above PLUS:

• A $50.00 usage credit for the Resource Center (printouts, long searches, etc.)
• Your support helps Sing Out! increase the exposure of all forms of folk music, and create more opportunities for musicians to create the music you enjoy.

  United States       1 year - $100.00
  Canada              1 year - $105.00
  Overseas, airmail   1 year - $118.00

All Rates are in U.S. dollars