Any hands with bendable fingers?

ball-jointed or silicone?

There are!

http://gensoushop.cart.fc2.com/

Not exactly cheap, though.  I don't have any, myself.  Sounds like you need a shopping service to buy them.  

http://www.dollfiedreams.com/viewtopic.php?f=21&t=18021

Here's the thread from the old site discussing them.  

Also found these https://item.taobao.com/item.htm?spm=a312a.7700824.w4004-18568631397.16.76adae84fyLSQG&id=559128081255

Can someone tell me if this is a good store and how much it is? The price looks odd to me.

Here is a web site that sells them. There's a person on Facebook who is doing a per order for them.

http://gensoushop.cart.fc2.com/