They are kinda spendy but I feel are worth every penny.. Look up WS55 pads on ebay. It is being sold out of Japan only it seems from seller buyfromjapan..The pads themselves are not bad around $22. But it cost around $12 for shipping from Japan. I looked everywhere and this vendor is the only one that sells these it seems.
So I did get my new WS55 pads in and the new out of box pair actually fit the ES700 even better than my pair I took off my WS55. The WS55 has somewhat of an oval shape to the cups and the WS55 pads on them was stretched out to fit that oval shape. The new WS55 pads are round instead of oval so they actually fit even better. And I can confirm they are 100% exact same pads I have on my WS55.