I found a website that has down-loadable pattern templates to make your own sock blockers.  You just print, pick the size you need and you are good to go.

The website is here: http://cyberseams.com/article/105710/all_things_knitting/how_to_make_your_own_sock_blockers.html

For gift giving I used their template and cut the shapes out of cardboard [that otherwise would have gone in the trash] and put the handmade socks on slippers on the foot shapes.