I recently found a site for a lady who makes custom knitted Sackboys. Now, places like play.com and firebox.com sell their own branded plush Sackboy - I'm yet to see one in person but the images on the site suggest something like this;
However, Maggie Wang over at her own personal/portfolio site has taken it upon herself to create her own incredible custom crochet ones.
Thats right... regular Sackboy, Astroboy, Spock, Hellboy, Prince Of Persia and Kratos from God Of War Sackboys. Oh my.
Visit her site at http://magyss.com/store/commissions.html to check out prices, etc.
I'm DEFINITELY tempted to commission a Hellboy one...