I hadn't heard of the M.I.M.S suppressor before and found this company seems to make a version of it now. You may see if their mounts would fit an original. I have no idea how legitimate the company is, I've never done business with them.
http://gordonspecialtyarms.com/?page_id=1132
Another method to save on shipping is to use pirateship.com. It is like a free version of Stamps.com where you print the label yourself. It has saved me a bunch on selling random small gun parts.