Garters

I'm looking for a specific garter/garter charm, have been having a little trouble finding it, and was hoping you lovely ladies would have a suggestion of where to find it.

Right now I'm torn between wearing a sports garter (which I have found) or one that has a charm for the Merchant Marines (which I can't find). So opinions on which and also where to find the MM one would be greatly appreciated.

TIA.