Good morning all! My most expensive pot would have top be my Hagi Kyusu that I had specially ordered through Toru-San at www.artisticnippon.com
To match it I also have a cup (yunomi) and a water cooling vessel (yuzamashi) (we wont even go into how much the whole set-up cost, but they are all from the same potter--Shibuya Deishi). The pot, before shipping was a little under $200 (he had some for about $70, but I had some specs that I wanted put into the pot). Even though shipping put it over $200, coming from Japan, the pot was not over that, therefore my answer for the pole is "less than $200"
*This morning I am drinking 2006 Wu's Reserve Ripe Pu-Erh out of my green dragon egg shaped 120ml (4. oz) Yixing