In the US, a subscription is 49.95 per year, but if yours is about to expire, you will either get a free 6 month extension or more information on next steps to switch from OneCare. I believe that the extensions are still happening at this time, though.
See here:
http://onecare.live.com/standard/en-us/activation/oc_eol_guidance.htm-steve
Microsoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator