So I happened to purchase a secondhand Shinki for spare parts, and now my slight OCD wants to find more spare parts for the secondhand junked body so I can at least buy an EX set to complete her. Unfortunately there doesn't seem to be a very big market for tiny missing bits of Shinki - I personally only need a pair of non-armored feet, and that's the one MMS body part no one seems to sell.

Does anyone have a good place/person to go to for things like replacement hands, feet, etc. without shelling out for basically a whole other MMS body?

YJA (Yahoo Japan Auctionhouse) used to have people selling extra parts from when they'd cannibalize parts from sets, but I don't know how active that is anymore.

Your best bet might be Taobao, as I've seen short runs of bits there. Usually resin, but I'm not really the guy you'd ask for that.

Alternatively, for something like feet, you might be able to model and print it out yourself (or beg a model off one of our modelers here).