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I registered to take the bar in one state (and paid for it) and I have an interview in a different state coming up. The deadline to register for the bar in the second state is going to happen before I get any sort of answer from this interview. Registering for the second state's bar is expensive and non-refundable, and if I don't get an offer from this firm, I am unlikely to end up in the second state.
What should I do? Should I burn a thousand bucks registering for a bar that might be useful but might not be? Or should I take the other state's bar in July and tell this employer that I will have to take the bar later? Is there anything else I can do? I can't find any information about late registration. Do some states offer late registration with a penalty?

Yes some states have extended registration deadlines that cost more. What's your financial situation? How badly do you want this job? What do you think your likelihood of getting this job is?

I generally think people should err on the side of caution and put themselves in the best possible situation re job interviews. But $1000 is not pocket change and depending on your financial situation could be quite a risk to take.