We have been planning a trip to Iceland (mostly to see the aurora) next year. I am now looking into tours that go near the volcano at Bárðarbunga and Holuhraun as well.
I think that land tours (I would love to stand next to the lava front) are out of the question, since the authorities have closed the area for ~18 miles around.
But there appear to be a couple air tours flying from Akureyri to Bárðarbunga, Holuhraun, and over the Askja crater for a little more than US$300 per person. The view from the planes can been seen in these Youtube Videos… I’m psyched.