I don't know your background and if you have military eligibility, but we stayed at KMC every time we went to the Big Island. That was inexpensive and nice, but dining options are limited if you don't bring your own food. They have full kitchens so you can stock up. The cafeteria was....well...kind of institutional, and food at the Volcano house was expensive. Nothing else is nearby, it is literally out in boonies, but great for volcano watching/hiking.
Thank you for your response. We don’t qualify for the military eligibility. However, hopefully someone who does may find your comment very helpful.