Humira or Abbvie(the pharmaceutical company) have a patient assistance program for those that have commercial insurance. It isn't financial based so basically it covers the majority of your out of pocket expense. When my son was on humira we paid 5 dollars per 3 shots. The program is called Humira Complete if you'd like to Google it.
If you are on Medicaid or medicare then they may have another program but there may be other programs. Same for those that aren't insured, there may be another program they can help you qualify for.