@Admin: I'm a grammar Nazi and I do not believe that enough edits have been made to the original poster's post.
Now more seriously, a few months ago the most common 4x4x4 speedcubes were made by Dayan+Mf8 and Shengshou (i.e. Shengshou 4x4x4 V. III, or version three)
Those cubes can be found on Google along with their prices.
lol, here to help ^_~