Oh yeah, I should try to stay on topic instead of derailing
Finished glazed pots are worth a lot because it's a skilled art people have to learn, and the equipment necessary to fire the clay ain't cheap. The bigger the pot, the more expensive because look up Kilns on Amazon and notice the price jump from 4" to 12" or bigger. The general consensus I've seen is to not worry about a nice pot until a tree is "finished." Which as a traditional ink artist makes sense. You wouldn't put a $20 poster or $50 art print in a $1000 hand carved wooden picture frame. So don't worry about having a super nice pot for a beanpole in training. If you want cheap pots but more attractive than the standard black plastic bonsai trainer pots, you can find some bonsai like mass produced pots at big box stores, or get a diamond tipped hole saw bit and a cordless drill and go thrift store/garage sale shopping for old decorative bowls and pier 1 type mass produced pottery. Or search in Google or Amazon for "shallow succulent pot" as succulents are all the rage right now and Bonsai as a hobby suffers from the same price hike issues as Boats, RV, and Hydroponics...as in you attach those words to any object and the price immediately goes up by x2-x3 the price..i.e. "RV kitchen faucet" or "Hydroponic pump". Or go the diy concrete route...which can be as simple as pouring concrete over a balloon to create a moon shape pot that I see everywhere, and then popping the balloon when it dries.
Example of 2 seconds of googling "shallow succulent pot" and finding a cool looking bonsaiish pot for cheaper than a "hand made and glazed Bonsai pot"
ebay listing