And those are pretty much the only ones out there. Did you look at any of the shops at Downtown Disney? I know World of Disney had a few (but I've also heard they stopped carrying some). And the other jewelry store there supposedly has some...
When I was looking for rings, I searched ENDLESSLY for some Disney inspired bands and found nothing.
The only other option is to possibly talk to a goldsmith or jeweller to see about custom bands. Some may hesitate to do anything with the traditional Disney icons (i.e. mickey head) because of copyright issues, but I'm sure you can find someone who can come up with something.