Any universal AC adapter should work, provided it meets two conditions:
1. The output specifications need to be identical to the specifications of the original adapter.
2. The barrel or other connector going into laptop must also be identical.
My suggestion take it in to Radio Shack and “build” an adapter with their universal parts. That way you can test it there and make sure it works before you leave the store.
I think I'll try that. The trouble I have been having is that the 150NB is fairly common but I have a 150NB-D which appears to be the only one made. Again, thanks everyone for your help.