Have you checked out any of the dragon figures online? Toys R us tends to carry them as well as uniforms. I'd get replacement uniforms and weapons for my sons GI Joes as the Hasbro stuff was cheaply made. Try 1/6th scale you'll have better luck.
Personally, I'm not aware of seventh scale figures or models, but the sixth scale has lots to offer in terms of articulated and resin kit military figures.
These are all my links to sixth scale articulated figures - I've never bought anything from them yet, so have no clue regarding their costumer service.
What exactly are you looking for? I have a bunch I would love to get rid of! They are 1/6th scale, World War II and are 20th Century Toys. They're at home, but I can get pictures if you are interested.