Best path for interior design (NCIDQ exam) for bachelors in another field?

[allvia]

You may want to do a search, even a google search of possible inexpensive institutions... You can then try to ladder any credits to maximize the transfer of those credits into the program of choice.  Most institutions will have a transfer policy, from 60-90 max transfer credits into their Bachelors program, you can always inquire about the option to take alternative or NA credits on a case-by-case basis if they have conditional acceptance options.

I'll add that this would also be a 2nd bachelor, so there may be far more opportunities available. As many schools offer special waivers for 2nd bachelors.