Yes, money is important — but don't obsess over it.
Again, bringing it up too early, or too frequently, will send the wrong message. Focus more on why you're excited about the opportunity and less on how much the salary will influence your decision on whether or not you'd take the job.
It's especially important that you not make threats like, "If you can't give me $100,000, I won't take the job," or, "I'll only accept if you give me $100,000." Even if that's what you're thinking, don't say it out loud.