If you are looking for smaller steeps, and do not mind ordering from over seas, for a gaiwan I recommend the Teamasters 60-70 ml gaiwan, the Qingbai mini gaiwan. http://teamasters.blogspot.com/2005/07/tea-masters-blog-selection.html#comments/
I personally do not know a good source for yixing teapots, unless you are selling your kidney for one.
Most styles of Japanese teaware can be found for a reasonable price, with great service from Artistic Nippon. http://www.artisticnippon.com/
Taiwanese wares are fun, but most I have found is wonderful celadon cups. I also personally enjoy Korean teaware, but besides mass produced sets those almost require personal connections to find. But under Tea merchandiser on this forum you can find some stuff channeled through a current member Tead Off.
I hope this gets you started. Again without knowing exactly what you want its hard to really point you straight to one spot.