Just to clarify to all present and future readers, the kanji for "Arita" are 有田 - so if you see these characters on a piece of porcelain, it's a good bet that it's Arita-yaki.
So, for instance, Maneki Neko, your second cup reads "Arita" on the bottom.
Here is my contribution:
This is a very very inexpensive dobin teapot. It's about 500mL in size and has a metal mesh infuser basket. I use it for brewing herbals & tisanes such as rooibos or for casually serving a large number of people. It doesn't get much use, so I didn't spend very much on it, but I decided to buy it after several occasions when I wasn't prepared to serve tea to a number of guests who were visiting.