These guys have everything listed in standard sizes, but will do custom sizing if you ask real pretty.
Once I went to a Star Wars trivia panel at ComicCon and sat on the floor against the back wall. A Stormtrooper decided to mess with me by standing over me and staring silently down with his blaster out. It was sorta terrifying. When my husband sent me this link I suddenly remembered that moment and got all nervous. /random