In my experience, absolute best was to buy pots at Bonsai Shows. This way you can see and feel the workmanship live and in person. I am lucky enough to live between Chicago and Milwaukee, which means at least 3 shows a year with vendors. I also am willing to travel to see a Bonsai show, from Columbus OH to Cleveland, to Minneapolis, to Atlanta, and even to a Denver bonsai show once. When I was working, I would try to visit bonsai vendors when ever sent on business travel. Pots tuck into luggage or can be shipped if you are flying. But do make bonsai one of your reasons to hop in a car and drive for 3 or 4 hours. (or more if you want) Luckily, I enjoy driving. ABS website lists many shows, the forum here lists them also.