I have no idea what you are looking for. I mean, I could tell you that Frank Muller makes great pots for a great price. Or that MADE bonsai pots does great custom pots, incuding pot-design suggestions based on the trees. I tsjech republic there are a number of potters that make very affordable larger pots. And you know of IBUKI I am sure; The question to me is too open-ended to tell you anything usefull.
In short: Go to a potter whose pots you like. If you look for something not in the shop, send them an email and ask them whether they would be able to make one to order. Most of them do NOT ask a lot more than the pots in the store, as the work and material involved are not much more.,